QNT 275 STUDY T Transform Yourself--qnt275study.com

1. QNT 275 Week 2 Homework Problem Set Excel File FOR MORE CLASSES VISIT www.qnt275study.com 1. In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 69, 67, 71, 72, 65, 75, 68, 68, 83, 73, 68. Calculate the measures of central tendency (Mean, median, mode) and the measures of dispersion (range, standard deviation, variance). 2. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes). 117, 123, 110, 117, 99, 120, 148, 118, 119, 120, 45, 130, 118 What is the 72d percentile? 3. The average life of Canadian women is 73.90 years, and the standard deviation of the life expectancy of Canadian women is 9 years. Based on Chebyshev's Theorem, determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 95 percent of the population is included if the sample size is 100 women.

2. 4. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 121, 114, 116, 110, 120, 145, 118, 119, 121, 45, 135, 118. Calculate the measures of central tendency (Mean, median, mode) and the measures of dispersion (range, standard deviation, variance). ============================================== QNT 275 Week 3 Homework Problem Set Excel File FOR MORE CLASSES VISIT www.qnt275study.com 1. A survey is made in a neighborhood of 90 voters. 75 are Democrats and 15 are Republicans. Of the Democrats, 30 are women, while 7 of the Republicans are women. If one subject from the group is randomly selected, find the probability the individual is a male Republican.

3. 2. Container 1 has 8 items, 3 of which are defective. Container 2 has 5 items, 3 of which are defective. If one item is drawn from each container, what is the probability that only one of the items is defective? 3. A letter is drawn from the alphabet of 26 letters. What is the probability that the letter drawn is a vowel? 4. A family has two children. What is the probability that both are girls, given that at least one is a girl? 5. If n = 29 and p = .6, then the standard deviation of the binomial distribution is ============================================== QNT 275 Week 4 Homework Problem Set Excel File FOR MORE CLASSES VISIT www.qnt275study.com

4. 1. A sample of 100 items has a population standard deviation of 5.9 and a mean of 32. Construct a 95 percent confidence interval for μ. 2. At the end of 1990, 1991, and 1992, the average prices of a share of stock in a portfolio were $34.75, $34.65, and $31.25 respectively. To investigate the average share price at the end of 1993, a random sample of 75 stocks was drawn and their closing prices on the last trading day of 1993 were observed with a mean of 33.78 and a standard deviation of 14.25. Estimate the average price of a share of stock in the portfolio at the end of 1993 with a 90 percent confidence interval. 3. A research study investigated differences between male and female students. Based on the study results, we can assume the population mean and standard deviation for the GPA of male students are µ = 3.3 and σ = 0.3. Suppose a random sample of 1200 male students is selected and the GPA for each student is calculated. Find the interval that contains 90 percent of the sample means for male students. 4. A manufacturing company measures the weight of boxes before shipping them to the customers. If the box weights have a population mean of 80 lb and standard deviation of 6 lb, respectively, then based on a sample size of 100 boxes, what is the probability that the average weight of the boxes will exceed 83 lb? 5.

5. A random sample of size 100 is taken from a population with mean 64 and standard deviation 5.2. Find P(x bar < 60). ============================================== QNT 275T Apply Week 1 Connect Exercise (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com Week 1 Connect Exercise (All Possible Question Answers) QNT/275T College entrance exam scores, such as SAT scores, are an example of a(n)________ variable. ______ is a necessary component of a runs plot. Jersey numbers of soccer players is an example of a(n)______ variable. An identification of police officers by rank would represent a(n)________ level of measurement. ==============================================

6. QNT 275T Apply Week 2 Connect Exercise (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com 1) An interval that contains a specified percentage of the individual measurements is called a(n) _______________ interval. 2) A CFO is looking at what percentage of a company's resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph. What would be the class length used in creating a frequency histogram? 3) When grouping a large sample of measurements into classes, the ______________ is a better tool than the ___________. 4) All of the following are measures of central tendency except the ____________. 5) The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z-score for the lateness of this particular airplane.

7. 6) If a population distribution is skewed to the right, then, given a random sample from that population, one would expect that the ____________. 7) Local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. What percentage of purchases were plasma televisions by customers with the smallest credit balances? ============================================== QNT 275T Apply Week 3 Connect Exercise (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com Week 3 Quiz Consider a standard deck of 52 playing cards, a randomly selected card from the deck, and the following events: R = red, B = black, A = ace, N = nine, D = diamond, and C = club.

8. Are D and C mutually exclusive? Yes, mutually exclusive. If the mileage per gallon for a car is normally distributed, 32 mpg has a z score of 1.2, and 24 mpg has a z score of −.4, what is the mean mpg of the distribution? The life of a light bulb is exponentially distributed with a mean of 1,000 hours. What is the probability that the bulb will last less than 800 hours? A letter is drawn from the alphabet of 26 letters. What is the probability that the letter drawn is a vowel? A survey is made in a neighborhood of 80 voters. 65 are Democrats and 15 are Republicans. Of the Democrats, 35 are women, while 5 of the Republicans are women. If one subject from the group is randomly selected, find the probability the individual is a male Republican. Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 8 minutes. Suppose that in an effort to provide better service to the public, the director of the local office is permitted to provide discounts to those individuals whose waiting time exceeds a predetermined time. The director decides that 15 percent of the customers should receive this discount. What number of minutes do they need to wait to receive the discount?

9. Container 1 has 8 items, 3 of which are defective. Container 2 has 5 items, 2 of which are defective. If one item is drawn from each container, what is the probability that only one of the items is defective? ============================================== QNT 275T Apply Week 4 Connect Exercise (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Apply Week 4 Connect Exercise (All Possible Question Answers) 1) A sample of 100 items has a population standard deviation of 5.1 and a mean of 21.6. Construct a 95 percent confidence interval for μ. 2) Recently, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain, many consumers refused to visit the restaurant for some time after the event. A survey was conducted three months after the food poisoning occurred, with a sample of 319 former customers contacted. Of the 319 contacted, 29 indicated that they would not go back to the restaurant because of the

10. potential for food poisoning. Construct a 95 percent confidence interval for the true proportion of the market who still refuse to visit any of the restaurants in the chain three months after the event. ============================================== QNT 275T Apply Week 5 Connect Exercise (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Apply Week 5 Connect Exercise (All Possible Question Answers) 1) When the assumption of __________ residuals (error terms) is violated, the Durbin-Watson statistic is used to test to determine if there is significant _____________ among the residuals. 2) In a simple linear regression analysis, the correlation coefficient (r) and the slope (b) ___________ have the same sign. Always 3) XYZ Company, Annual Data

11. 4) The simple linear regression (least squares method) minimizes 5) When using simple exponential smoothing, the value of the smoothing constant α cannot be negative or 6) If the Durbin-Watson statistic is greater than (4 − dL), then we conclude that 7) In a simple regression analysis for a given data set, if the null hypothesis β = 0 is rejected, then the null hypothesis ρ = 0 is also rejected. This statement is ___________ true. 8) The demand for a product for the last six years has been 15, 15, 17, 18, 20, and 19. The manager wants to predict the demand for this time series using the following simple linear trend equation: trt = 12 + 2t. What are the forecast errors for the 5th and 6th years? 9) In performing a chi-square goodness-of-fit test for a normal distribution, a researcher wants to make sure that all of the expected cell frequencies are at least five. The sample is divided into 7 intervals. The second through the sixth intervals all have expected cell frequencies of at least five. The first and the last intervals have expected cell frequencies of 1.5 each. After adjusting the number of intervals, the degrees of freedom for the chi-square statistic is ____. 10) The chi-square goodness-of-fit test for multinomial probabilities with 5 categories has _____ degrees of freedom.

12. ============================================== QNT 275T Entire Course FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Week 1 Discussion Statistics Tools QNT 275T Week 1 Practice Knowledge Check QNT 275T Apply Week 1 Connect Exercise QNT 275T Week 2 Discussion Charts QNT 275T Apply Week 2 Connect Exercise QNT 275T Week 2 Practice Knowledge Check QNT 275T Week 3 Discussion Sales Training QNT 275T Apply Week 3 Connect Exercise QNT 275T Week 3 Practice Knowledge Check QNT 275T Week 4 Discussion Income and Insurance QNT 275T Week 4 Practice Knowledge Check QNT 275T Apply Week 4 Connect Exercise QNT 275T Week 5 Discussion The Tasty Sub Shop Case and The QHIC Case QNT 275T Apply Week 5 Connect Exercise QNT 275T Week 5 Practice Knowledge Check

13. QNT 275 New Week 2 Homework Problem Set Excel File QNT 275 Week 3 Homework Problem Set Excel File QNT 275 New Week 4 Homework Problem Set Excel File ============================================== QNT 275T Week 1 Discussion Statistics Tools FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Week 1 Discussion Statistics Tools Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words: Review the Discussion FAQs Module. Choose one statistical tool that you read about this week. Consider a decision you need to make at work or at home. Explain how this tool will help you make that decision. Note: This must be original; do not use examples from the internet. Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ==============================================

14. QNT 275T Week 1 Practice Knowledge Check (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Week 1 Practice Knowledge Check (All Possible Question Answers) 1) A sequence of operations that takes inputs and turns them into outputs is a ________.

15. 2) Time series data are data collected at the same time period. 3) Cross-sectional data are data collected at the same point in time. 4) The number of sick days taken by employees in 2008 for the top 10 technology companies is an example of time series data.

16. 5) Any characteristic of an element is called a ______. 6) ______ uses traditional or newer graphics to present visual summaries of business information. 7) Daily temperature in a local community collected over a 30- day time period is an example of cross-sectional data.

17. 8) Secondary data are data taken from an existing source. ============================================== QNT 275T Week 2 Discussion Charts FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Week 2 Discussion Charts Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words:

18. Review the Discussion FAQs Module. Research the internet for an example of a pie chart or bar chart. Post a copy along with its source. Include a question regarding the chart for your classmates to respond to. Respond to a classmate’s question Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ============================================== QNT 275T Week 2 Practice Knowledge Check (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com Wk 2: Practice: Week 2 Knowledge Check (All Possible Question Answers) 1. In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65, 77, 67, 66. What is the median?

19. 77.0 73.0 72.0 71.0 71.5 To calculate median, put data measurements in ascending order. The median for an even number of measurements is the average of the middle two measurements; (71+73)/2 = 2. The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers, with the following results.

20. $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 What is the IQR? 3. Which of the following is not a graphical tool for descriptive analytics (dashboards)? 4. All of the following are measures of central tendency except the ____________.

21. 5. The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set. False 6. In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the mean? 7. A quantity that measures the variation of a population or a sample relative to its mean is called the ____________. variance coefficient of variation

22. range standard deviation interquartile range 8. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the mode? 118 114.15 148 45

23. 115.5 Mode is the value(s) that appears most frequently; mode = 118 (occurs three times). 1) The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes).

24. 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118 What is the IQR? 28 2) The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.). They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows (in minutes): 118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118. What is the median? 118

25. 3) Quality control is an important issue at ACME Company, which manufactures light bulbs. Totest the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mode? 375 4) In a hearing test, subjects estimate the loudness (in decibels) of a sound, and the results are: 68, 67, 70, 71, 68, 75, 68, 62, 80, 73, 68. What is the mean?

26. 5) Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the median? 6) When establishing the classes for a frequency table, it is generally agreed that the more classes you use the better your frequency table will be.

27. 7) Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted: 378, 361, 350, 375, 200, 391, 375, 368, 321. What is the mean? 8) Which percentile describes the first quartile, Q1? 9) Quality control is an important issue at ACME Company, which manufactures light bulbs. To test the life-hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the range?

28. 10) Personnel managers usually want to know where a job applicant ranked in his or her graduating class. With a grade point average of 3.83, Michelle Robinson graduated above the 93rd percentile of her graduating class. What is the percentile rank of a student whose GPA was the median GPA. 11) In the least squares line, ___________ is defined as rise/run. ============================================== QNT 275T Week 3 Discussion Sales Training FOR MORE CLASSES VISIT www.qnt275study.com QNT 275T Week 3 Discussion Sales Training

29. Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words: A company employs 400 salespeople. Of these, 83 received a bonus last year, 100 attended a special sales training program at the beginning of last year, and 42 both attended the special sales training program and received a bonus. (Note: the bonus was based totally on sales performance.) a) What proportion of the 400 salespeople received a bonus last year? b) What proportion of the 400 salespeople attended the special sales training program at the beginning of last year? c) What proportion of the 400 salespeople both attended the special sales training program and received a bonus? d) What proportion of the salespeople who attended the special sales training program received a bonus?

30. e) Based on your answers to parts a and d, does the special sales training program seem to have been effective? Explain your answer. Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ============================================== QNT 275T Week 3 Practice Knowledge Check (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com Week 3 Knowledge Check (All Possible Question Answers) In a local survey, 100 citizens indicated their opinions on a revision to a local land-use plan. Of the 62 persons giving favorable responses,

31. 40 were males. Of the 38 giving unfavorable responses, 15 were males. If one citizen is randomly selected, find the probability that person is male and has a favorable opinion. The set of all possible outcomes for an experiment is called a(n) ____________. Probabilities must be assigned to each sample space outcome so that the probabilities of all the sample space outcomes add up to _____________.

32. New car owners were asked to evaluate their experiences in buying a new car during the past 12 months. In the survey, the owners indicated they were most satisfied with their experiences at the following three dealers (in no particular order): Subaru, Honda, and Buick. Assuming that each set of rankings is equally likely, what is the probability that owners ranked Subaru third? The internal auditor for your company believes that 10 percent of your invoices contain errors. To Check (All Possible Question Answers) this theory, 20 invoices are randomly selected, and 5 are found to have errors. What is the probability that of the 20 invoices selected, 5 or more would contain errors if the theory is valid? The standard deviation of a standard normal distribution is always equal to 1.

33. If A and B are independent events, P(A) = .2, and P(B) = .7, determine A fair die is rolled 10 times. What is the average number of even number outcomes?

34. 1. In a statistical study, the random variable X = 1 if the house is colonial, and X = 0 if the house is not colonial. The random variable X is continuous. 2. The expected value of the discrete random variable x is the population mean. 3. If the random variable x is normally distributed, ______ percent of all possible observed values of x will be within three standard deviations of the mean. 4. Given that X is a normal random variable, the probability that a given value of X is below its mean is ________________. 5. Consider a standard deck of 52 playing cards, a randomly selected card from the deck, and the following events: R = red, B = black, A = ace, N = nine, D = diamond, and C = club.

35. Are R and C mutually exclusive? 6. Consider a standard deck of 52 playing cards, a randomly selected card from the deck, and the following events: R = red, B = black, A = ace, N = nine, D = diamond, and C = club. Are D and C mutually exclusive? 7. Which of the following statements about the binomial distribution is not correct? 8. If the random variable x is normally distributed, 68.26 percent of all possible observed values of x will be within two standard deviations of the mean.

36. 9. An important part of the customer service responsibilities of a cable company is the speed with which trouble in service can be repaired. Historically, the data show that the likelihood is 0.75 that troubles in a residential service can be repaired on the same day. For the first five troubles reported on a given day, what is the probability that all five will be repaired on the same day? 10. Consider a standard deck of 52 playing cards, a randomly selected card from the deck, and the following events: R = red, B = black, A = ace, N = nine, D = diamond, and C = club. . 11. If the random variable of x is normally distributed, _____ percent of all possible observed values of x will be within two standard deviations of the mean. 12. In a local survey, 100 citizens indicated their opinions on a revision to a local land-use plan. Of the 62 persons giving favorable responses, 40 were males. Of the 38 giving unfavorable responses, 15

37. were males. If one citizen is randomly selected, find the probability that person is male and has a favorable opinion. 13. Suppose that you believe that the probability you will get a grade of B or better in Introduction to Finance is .6 and the probability that you will get a grade of B or better in Introduction to Accounting is .5. If these events are independent, what is the probability that you will receive a grade of B or better in both courses? 14. The time (in seconds) it takes for an athlete to run 50 meters is an example of a continuous random variable. 15. In a binomial distribution, the random variable X is continuous.

38. 16. At an oceanside nuclear power plant, seawater is used as part of the cooling system. This raises the temperature of the water that is discharged back into the ocean. The amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° C. What is the standard deviation of the temperature increase? 17. A continuous probability distribution having a rectangular shape, where the probability is evenly distributed over an interval of numbers is a(n) ____________ distribution. 18. The z value tells us the number of standard deviations that a value x is from the mean. 19. A fair die is rolled 10 times. What is the average number of even number outcomes?

39. 20. A random variable is a numerical value that is determined by the outcome of an experiment. 21. A continuous random variable may assume only integer values in a given interval. 22. A survey is made in a neighborhood of 80 voters. 65 are Democrats and 15 are Republicans. Of the Democrats, 35 are women, while 5 of the Republicans are women. If one subject from the group is randomly selected, find the probability the individual is a Democrat or a Republican. ============================================== QNT 275T Week 4 Discussion Income and Insurance FOR MORE CLASSES VISIT www.qnt275study.com

40. QNT 275T Week 4 Discussion Income and Insurance Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words: Suppose that we wish to assess whether more than 60 percent of all U.S. households in a particular income class bought life insurance last year. That is, we wish to assess whether p, the proportion of all U.S. households in the income class that bought life insurance last year, exceeds .60. Assume that an insurance survey is based on 1,000 randomly selected U.S. households in the income class and that 640 of these households bought life insurance last year. a) Assuming that p equals .60 and the sample size is 1,000, what is the probability of observing a sample proportion that is at least .64? b) Based on your answer in part a, do you think more than 60 percent of all U.S. households in the income class bought life insurance last year? Explain. Due Monday

41. Reply to at least two of your classmates. Be constructive and professional in your responses. ============================================== QNT 275T Week 4 Practice Knowledge Check (All Possible Question Answers) FOR MORE CLASSES VISIT www.qnt275study.com Week 4 Knowledge Check (All Possible Question Answers) If we have a sample size of 100 and the estimate of the population proportion is .10, we can estimate the sampling distribution of pˆp^ with a normal distribution.

42. The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true. As the sample size increases, the standard deviation of the sampling distribution increases. A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1,500 voting age citizens. 1,020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. What is the alternative hypothesis?

43. If the sampled population distribution is skewed, then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30. A research study investigated differences between male and female students. Based on the study results, we can assume the population mean and standard deviation for the GPA of male students are µ = 3.5 and σ = 0.5. Suppose a random sample of 100 male students is selected and the GPA for each student is calculated. What is μx¯μx¯? It has been reported that the average time to download the home page from a government website was 0.9 seconds. Suppose that the download times were normally distributed with a standard deviation of 0.3 seconds. If random samples of 23 download times are selected,

44. describe the shape of the sampling distribution and how it was determined. In the upcoming election for governor, the most recent poll, based on 900 respondents, predicts that the incumbent will be reelected with 55 percent of the votes. From the 900 respondents, how many indicated that they would not vote for the current governor or indicated that they were undecided? 1) Based on a random sample of 25 units of product X, the average weight is 102 lb and the sample standard deviation is 10 lb. We would like to decide if there is enough evidence to establish that the average weight for the population of product X is greater than 100 lb. Therefore, the alternative hypothesis can be written as HA: μ > 100. (Assume the population is normally distributed.)

45. True 2) The power of a statistical test is the probability of rejecting the null hypothesis when it is false. True 3) A research study investigated differences between male and female students. Based on the study results, we can assume the population mean and standard deviation for the GPA of male students are µ = 3.5 and σ = 0.5. Suppose a random sample of 100 male students is selected and the GPA for each student is calculated. What is μx⎯⎯μx¯?

46. 3.5 4) The t distribution always has n degrees of freedom. False 5) A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1,500 voting age citizens. 1,020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. Identify the null hypothesis.

47. 6) In the upcoming election for governor, the most recent poll, based on 900 respondents, predicts that the incumbent will be reelected with 55 percent of the votes. From the 900 respondents, how many indicated that they would not vote for the current governor or indicated that they were undecided? 7) If p = .8 and n = 50, then we can conclude that the sampling distribution of pˆp^ is approximately a normal distribution.

48. 8) A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1,500 voting age citizens. 1,020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. What is the alternative hypothesis? p 9) According to the Central Limit Theorem, if a sample size is at least _____, then for most sampled populations, we can conclude that the sample means are approximately normal.

49. 10) The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true. 11) The sampling distribution of a sample statistic is the probability distribution of the population of all possible values of the sample statistic. 12) If the sampled population distribution is skewed, then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30.

50. 13) If we have a sample size of 100 and the estimate of the population proportion is .10, we can estimate the sampling distribution of pˆp^ with a normal distribution. 14) For a given hypothesis test, if we do not reject H0, and H0 is true,