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4. In a test of the quality of two television commercials, each commercial was shown in a separate 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. Commercial A Commercial B Number Who Saw Commercial 150 200 Number Who Recalled Message 63 60 a. Use a = 0.05 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. 5. Eagle Outfitters is a chain of stores specializing in outdoor apparel and camping gear. They are considering a promotion that involves mailing discount coupons to all their credit card customers. This promotion will be considered a success if more than 10% of those receiving the coupons use them. Before going national with the promotion, coupons were sent to a sample of 100 credit card customers. a. Develop hypotheses that can be used to test whether the population proportion of those who will use the coupons is sufficient to go national. b. Use a= 0.05 to conduct your hypothesis test. Should Eagle go national with the promotion