A researcher for Procter & Gamble selects five states randomly,and then selects 10 supermarket chains within each of these states to call for a phone survey for a test market of a new shampoo.Which type of sampling procedure is being used?
A)systematic sample
B)simple random sample
C)nonprobability sample
D)cluster sample

Question

Quizplus · Accepted Answer

The researcher is using a cluster sample approach by first selecting five states as the clusters, and then selecting the 10 supermarket chains within each state. This method is practical and efficient, as it saves time and effort, but it may introduce a certain amount of bias into the selection process.

A Researcher for Procter & Gamble Selects Five States Randomly,and