Chapter 8, Problem 65SE

Reading (Example 14) The researchers in a Pew study interviewed two random samples, one in 2015 and one in 2018. Both samples were asked, “Have you read a print book in the last year?” The results are shown in the table below.

a. Find and compare the sample proportions that had read a print book for these two groups.

b. Find a pooled estimate of the sample proportion.

c. Has the proportion who read print books increased? Find the observed value of the test statistic to test the hypotheses ${\text{H}}_{\text{0}}:p_{2015}=p_{2018}$ and ${\text{H}}_{\text{a}}:p_{2015}<p_{2018}$ assuming the conditions for a two-proportion $z\text{-test}$ hold.