Pew Research published survey results from two random samples. Both samples were asked, “Have you listened to an audio book in the last year?” The results are shown in the table below.

a. Find and compare the sample proportions that had listened to an audio book for these two groups.

b. Are a greater proportion listening to audio books in 2018 compared to 2015? Test the hypothesis that a greater proportion of people listened to an audio book in 2018 than in 2015. Use a 0.05 significance level.

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Listened to an audio 2015 2018 Total book Yes 229 360 589 No 1677 1642 3319 Total 1906 2002