Chapter 8, Problem 74CRE

Choosing a Test and Naming the Population(s) In each case, choose whether the appropriate test is a one-proportion $z \text{-test}$ or a two-proportion $z \text{-test}\text{.}$ Name the population(s).

a. A researcher takes a random sample of 4-year-olds to find out whether girls or boys are more likely to know the alphabet.

b. A pollster takes a random sample of all U.S. adult voters to see whether more than $50\%$ approve of the performance of the current U.S. president.

c. A researcher wants to know whether a new heart medicine reduces the rate of heart attacks compared to an old medicine.

d. A pollster takes a poll in Wyoming about homeschooling to find out whether the approval rate for men is equal to the approval rate for women.

e. A person is studied to see whether he or she can predict the results of coin flips better than chance alone.