9
lesson pretestMultiple Choice

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Question 9 • Mathematics III

Researchers are conducting a survey about what brand of ice cream shoppers prefer. They survey the tenth person who walks into the store and then every fifth person after that. This type of sampling is called

Answer
A
random sampling.
B
cluster sampling.
C
stratified sampling.
D
systematic random sampling.

Explanation

The researchers choose people at a regular interval: they start with the tenth shopper and then select every fifth shopper. Selecting members of a population this way is systematic random sampling. Stratified and cluster sampling divide the population into groups before selecting participants.

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