AnswersGrade 7 MathematicsSampling and Comparing Populations — TestQuestion 22
22
QuizMultiple Choice

Sampling and Comparing Populations — Test

Question 22 • Grade 7 Mathematics

Adriana, Henry, Malik, and Richard each design surveys to determine the most popular way seventh graders purchase music. Adriana samples the five friends sitting at her lunch table. Henry samples every boy in his homeroom class. Malik samples every student using an MP3 player while waiting for the bus. Richard samples the first student alphabetically on the class roster from each of 12 classes. Which sample is likely to produce the most valid results?

Answer
A
Richard’s sample
B
Malik’s sample
C
Adriana’s sample
D
Henry’s sample

Explanation

A valid sample should represent seventh graders with different music-buying habits, rather than favoring a particular group. Richard selects one student from each of 12 classes, so his sample includes students across many classes. Malik only surveys students using MP3 players, Henry surveys only boys, and Adriana surveys just five friends, so each of those samples is more biased or limited.

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