A snapshot in USA Today indicates that there is a gap in church attendence between 20-year-olds and older Americans.12 Suppose that we randomly select 100 Americans in each of five age groups and record the numbers who say they attend church in a typical week.

a. Do the data indicate that the proportion of adults who attend church regularly differs depending on age? Test using α = .05.

b. If there are signficant differences in part a, describe the nature of these differences by calculating  the proportion of churchgoers in each age category. Where do the significant differences appear to lie?

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Attend Church Regularly? 20s 30s 40s 50s 60+ Yes No No 31 69 47 53 48 52 53 47 42 58