7. In a test of the quality of two television commercials, each commercial was shown in a sepa- rate test area six times over a one-week period. The following week a telephone survey was conducted to identify individuals who had seen the commercials. Those individuals were asked to state the primary message in the commercials. The following results were recorded.

Number Who Saw Commercial Number Who Recalled Message Commercial A 150 Commercial B 200 63 60

a. Use a = .05 and test the hypothesis that there is no difference in the recall proportions for the two commercials.

b. Compute a 95% confidence interval for the difference between the recall proportions for the two populations.

a. Use α  .05 and test the hypothesis that there is no difference in the recall proportions for the two commercials.

b. Compute a 95% confidence interval for the difference between the recall proportions for the two population