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Mastering Predictions: Sample Survey Vocabulary

Learn to predict actions of a group using a sample survey. Understand terms like population, random sample, and data. Practice with percent proportion and equation. Answer pet-watching, after-school activities, and spring preferences.

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Mastering Predictions: Sample Survey Vocabulary

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  1. Transparency 3 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 3-2c Objective Predict actions of a larger group by using a sample

  4. Example 3-2c Vocabulary Survey A question or set of questions designed to collect data about a specific group of people

  5. Example 3-2c Vocabulary Population The entire group of items or individuals from which the samples under consideration are taken

  6. Example 3-2c Vocabulary Random sample A sample in which the members are selected purely on the basis of chance

  7. Example 3-2c Vocabulary Data Pieces of information that are often numerical

  8. Lesson 3 Contents Example 1Predict Using Percent Proportion Example 2Predict Using Percent Equation We will practice both the percent proportion and the percent equation You may use either method during homework practice or on the test but must use one or the other

  9. Example 3-1a PETSThe table shows the results of a survey in which people were asked whether their house pets watch television. Predict how many of the 540 people surveyed said their pets watch TV. Write percent proportion This is total people surveyed 1/2

  10. Example 3-1a PETSThe table shows the results of a survey in which people were asked whether their house pets watch television. Predict how many of the 540 people surveyed said their pets watch TV. 38 % said their pets watched TV 1/2

  11. Example 3-1a PETSThe table shows the results of a survey in which people were asked whether their house pets watch television. Predict how many of the 540 people surveyed said their pets watch TV. how many said their pets watch TV Define variable Refers to the part of the total 1/2

  12. Example 3-1b Find cross products Multiply Ask “what is being done to the variable?” The variable is being multiplied by 100 Do the inverse on both sides 1/2

  13. Example 3-1b Bring down 100a = 20,520 Using the fraction bar, divide both sides by 100 Combine “like” terms Use the Identity Property to multiply 1  a 100a = 20,520 100 100 Since the dimensional analysis is people must round to whole number 1  a = 205.2 a = 205.2 How many people surveyed said their pets watch TV. Answer: 205 of the people surveyed said pets watch TV 1/2

  14. Example 3-1c AFTER-SCHOOL ACTIVITIESIn a survey of middle school students, 32% responded that playing video games was their favorite after-school activity. Predict how many of the 260 students surveyed said that playing video games was their favorite after-school activity. Answer: 83 students said playing video games was their favorite activity 1/2

  15. Example 3-2a SUMMER JOBSAccording to one survey, 25% of high school students reported they would not get a summer job. Predict how many of the 948 students at Mohawk High School will not get a summer job. how many of the 948 students will not get a summer job Part = percent of total Words What number is 25% of 948? Variable Let n represent how many will not get a job  n 0.25 948 = Equation 2/2

  16. Example 3-2b The variable is already by itself Multiply. Add dimensional analysis How many students will not get a summer job? Answer: 237 students will not get a summer job. 2/2

  17. Example 3-2c * WEATHERAccording to one survey, 31% of adults consider spring to be their favorite season of the year. Predict how many of the 525 employees of a large corporation would respond that spring is their favorite season of the year. Answer: 163 employees considered spring their favorite season 2/2

  18. End of Lesson 3 Assignment

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