In a test quality of two television commercials, each commercial was shown is a seperate rate test

In a test quality of two television commercials, each commercial was shown is a seperate rate test are 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. &nbs p; Commercial A Commercial B # XXXXX Saw Commercial 150 200 #Who Recalled Commercial 63 60 a. Use a= .05 and test the hyposthesis 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.