A study examined whether the content of TV shows influenced the ability of viewers to recall brand names of items featured in the commercials. Analysts recorded the number of advertised brand names a group of people recalled immediately after watching TV shows and then that same group of people recalled 24 hours later. Strangely enough, it appears that they remembered more about the ads the next day. Should we conclude this is true in general about people's memory of TV ads? Complete parts a through d. a) Suppose one analyst conducts a two-sample hypothesis test to see if memory of brands advertised during violent TV shows is higher 24 hours later. The P-value is 0.0013. What might she conclude? the mean number of brand names recalled She might conclude that the mean number of brand names rcaled 24 hours after watching a violent TV show is (1) immediately after watching a violent TV show. b) Explain why her procedure was inappropriate. Which of the assumptions for inference was violated? 0 A. The groups are not independent. O B. The data was not collected with suitable randomization. C. The populations of each group are not normally distributed. 0 D. The individuals within the groups are not independent. c) How might the design of this experiment have tainted these results? O A. A subject with high recall nght after the show might have high recall 24 hours later as well. Also, the first interview might have helped the subjects to remember the brand names for a longer period of time than they would have otherwise Since the subjects were not selected at random, the first interview might have helped the subjects with high recall to remember the brand names for a longer period of time than they would have otherwise Since the populations of each group are not normally distributed, a two-sample t-test is not appropriate to compare the means between the two groups. Since the populations of each group are not normally distributed, subjects with high recall could skew the means for each group B. O C. 0 D. d) Suggest a design that could compare immediate brand name recall with recall one day later. 0 A. Randomly assign half of the group watching violent TV shows to be interviewed immediately after watching, while the other half of the group is interviewed 24 hours later. B. Assign subjects in the group with horrible short-term memory to be interviewed immediately after watching the violent TV show, and assign subjects with horrible long-term memory to be interviewed 24 hours later C. Assign the older half of the group watching violent TV shows to be interviewed immediately after watching, while the younger half of the group is interviewed 24 hours later Assign subjects in the group with good short-term memory to be interviewed immediately after watching the violent TV show, and assign subjects with good long-term memory to be interviewed 24 hours later. D. O greater than less than or equal to ( less than O greater than or equal to O not equal to O equal to
