# The researchers in a Pew study interviewed two random samples, one in 2015 and one in 2018.

## Question:

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 H_{0}: p_{2015} = p_{2018} and Ha: p_{2015} < p_{2018} assuming the conditions for a two-proportion z-test hold.

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**Related Book For**

## Introductory Statistics Exploring The World Through Data

**ISBN:** 9780135163146

3rd Edition

**Authors:** Robert Gould, Rebecca Wong, Colleen N. Ryan