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AP® Statistics

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Real World Application: Stratified

APSTAT-WKPLG4

A pollster hopes to determine the support distribution for three different mayoral candidates in a large city.

If a stratified sample is used, which of the following could the pollster do?

I. Randomly divide the subjects into three groups and then poll each group.
II. Divide the subjects into groups by race and then poll each group.
III. Divide the subjects into groups by gender and then poll each group.

A

I only.

B

II only.

C

I and II only.

D

II and III only.

E

I, II, and III.