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Homework

Homework. Homework Assignment #34 Review Section 9.8 Page 782, Exercises: 1 – 45(EOO), 47. Homework, Page 782. 1. Identify whether the number described is a parameter or a statistic. a. The average score on last week’s quiz was 73.4. Parameter

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Homework

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  1. Homework • Homework Assignment #34 • Review Section 9.8 • Page 782, Exercises: 1 – 45(EOO), 47

  2. Homework, Page 782 1. Identify whether the number described is a parameter or a statistic. a. The average score on last week’s quiz was 73.4. Parameter b. About 13% of the population is left-handed. Statistic c. In a study of laboratory rats, 93% became aggressive when deprived of sleep. Statistic

  3. Homework, Page 782 Find the mean of the data set. 5. {32.4, 48.1, 85.3, 67.2, 72.4, 55.3}

  4. Homework, Page 782 Find the mean of the indicated data. 9. The number of moons.

  5. Homework, Page 782 13. Determine the average annual home run production for Willie Mays and for Mickey Mantle for their career totals of 660 over 22 years and 536 over 18 years, respectively. Who had the greater production rate?

  6. Homework, Page 782 17. Find the median and mode of the numbers in the table. Mean = 84.823 There is no mode, as five numbers appear two times each and none appear more than two times.

  7. Homework, Page 782 21. Use the data in the table to find: A) The average (mean) monthly low temperatures for Beijing. B) Find the weighted average using the days in the month and assuming no leap year. C) Compare the results above. Do the weights have an effect? Why or why not? Which average is a better indicator? The weights only have a slight effect because the numbers of days per month vary slightly. The weighted average is better.

  8. Homework, Page 782 Determine the five-number summary, the range, and the inter-quartile range for given data. Identify any outliers. 25. The following salaries for the employees in one department of the Garcia Brothers Co. (in thousands of dollars): 33.5, 35.3, 33.8, 29.3, 36.7, 32.8, 31.7, 37.3, 33.5, 28.2, 34.8, 33.5, 29.7, 38.5, 32.7, 34.8, 34.2, 31.6, 35.4

  9. Homework, Page 782 Refer to the wind speed data in exercise 24. 29. Some wind turbine generators, to be efficient generators of power, require average wind speeds of at least 10.5 mph. Approximately what fraction of the climatic centers are suited for these wind turbine generators? Of the 44 centers, 12 or 3/11 of the climatic centers are suited for these wind turbine generators.

  10. Homework, Page 782 Find the standard deviation and variance of the data set. 33. {23, 45, 29, 34, 39, 41, 19, 22}

  11. Homework, Page 782 Find the standard deviation and variance of the data set. 37. The data in exercise 24.

  12. Homework, Page 782 41. In 1995, scores on the Scholastic Aptitude Test were re-scaled to their original mean of 500 with an approximate standard deviation of 100. SAT scores in the general population have a normal distribution. A) Approximately what percentage of 1995 scores fell between 400 and 600. Approximately 68% percent of the scores fell between 400 and 600. B) Approximately what percentage of 1995 scores fell below 300? Approximately 2.5% percent of the scores fell below 300. C) By 2001, the national average on the SAT Math section was 514. Is this number a parameter or statistic? The number 514 is a parameter, since it applies to the entire population.

  13. Homework, Page 782 45. The plot of a normal distribution will be A) symmetric B) skewed left C) skewed right D) lower in the middle than at the ends E) of no predictable shape

  14. Homework, Page 782 47. Professor Mitchell grades the exams of his 30 students and finds the scores have a mean of 81.3 and a median of 80.5. He later determines that the top student deserves 9 extra points for a misgraded proof. After the error is corrected, the scores have A) a mean of 81.3 and a median of 80.5 B) a mean of 81.6 and a median of 80.5 C) a mean of 81.6 and a median of 80.8 D) a mean of 90.3 and a median of 80.5 E) a mean of 90.3 and a median of 89.5

  15. Homework • Homework Assignment #35 • Review Sections 9.1 – 9.8 • Page 786, Exercises: 1 – 113 (EOO) • Chapter 9 test next time

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