Chapter 8, Problem 72CRE

Choosing a Test and Naming the Population(s) For each of the following, state whether a one-proportion $z\text{-test}$ or a two-proportion $z\text{-test}$ would be appropriate, and name the population(s).

a. A researcher takes a random sample of voters in western states and voters in southern states to determine if there is a difference in the proportion of voters in these regions who support the death penalty.

b. A sociologist takes a random sample of voters to determine if support for the death penalty has changed since 2015.