Kimberly and John are social psychology graduate students who share a research interest in the effectiveness of different media sources. Kimberly believes that NPR is a better way of delivering information, whereas John is a fan of CNN. Kimberly and John conduct an experiment in which they ask subjects to get their news exclusively from 1 of these sources source for 2 months; 16 people are assigned to the CNN group and 16 people to the NPR group. After the 2 months are up, all subjects take the same current-events test; scores range from {1-50, with higher scores indicating greater awareness of the major news stories from the 2-month period of the study. Assume current events knowledge is normally distributed. 7. Compute a 95% confidence interval to estimate the size of the population mean difference. (2)\f