AnswersMath 7 B M12 2526 S2Unit Test — Unit testQuestion 25
25
QuizMultiple Choice

Unit Test — Unit test

Question 25 • Math 7 B (M12 25/26 S2)

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

Explanation

A valid sample should represent the full group of seventh graders, not just one type of student or a few friends. Richard selects one student from each of 12 different classes, so his sample is spread across more of the grade. Adriana’s friends, Henry’s boys, and Malik’s MP3-player users may each share characteristics that affect how they purchase music.

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