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 H₀: p₂₀₁₅ = p₂₀₁₈ and Ha: p₂₀₁₅ < p₂₀₁₈ assuming the conditions for a two-proportion z-test hold.

Transcribed Image Text:

Read a print book 2015 2018 Total Yes 1201 1341 2542 No 705 661 1366 Total 1906 2002