今日份的SAT数学练习题1

>>SAT数学解析：今日份的SAT数学练习题1

>>SAT考试辅导

Mathematics>Standard Multiple Choice

Read the following SAT test question and thenclick on a button to select your answer.

A consumer-monitoring service wants to determinetelevision viewing habits among 18- to 29-year-oldsin a particular city. Which of the following survey methods is most likely to produce validresults?

A.Select a random sample of 1000 18- to 29-year-olds in that city.

B.Select a random sample of 1000 18- to 29-year-olds in that city who attended a computercamp when they were in high school.

C.Select a random sample of 1000 18- to 29-year-olds in that city who played a varsity sportin high school.

D.Select a random sample of 1000 18- to 29-year-olds in that city who played chess in highschool.

答案：A

解析：

Choice A is correct. In order to produce unbiased, valid data, the sample should be randomly selectedand be representative of the entire population ofinterest. In this case, an appropriately conductedsurvey should give each consumer aged 18 to 29 years in the city an equal chance of beingsurveyed.

The choices that involve a particular high school, the chess team, and computer camperswould not be representative of the entire population of 18- to 29-year-olds in the city.

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