A public opinion poll in Ohio was set up to determine whether registered voters in the state approved of a measure to ban smoking in all public areas. The researchers selected a simple random sample of 50 registered voters from each county in the state and asked whether the voters approved or disapproved of the measure. This is an example of:
A)a systematic county sample.
B)a stratified sample.
C)a multistage sample.
D)a simple random sample.

Question

Quizplus · Accepted Answer

The researchers have divided the population into counties (strata) and then took a simple random sample from each stratum. This is known as a stratified sample.

A Public Opinion Poll in Ohio Was Set Up to Determine