Question 1: Fully answer parts A, B, C, D, and E:

Is red wine better than white wine? Observational studies suggest that moderate use of alcohol by adults reduces heart attacks and that red wine may have special benefits. One reason may be that red wine contains polyphenols, substances that do good things to cholesterol in the blood and so may reduce the risk of heart attacks. In an experiment, healthy men were assigned at random to drink half a bottle of either red or white wine each day for two weeks. The level of polyphenols in their blood was Red wine: 3.5 8.1 7.4 4.0 0.7 4.9 8.4 7.0 5.5 measured before and after the two--week period. Here are the White wine: 3.1 0.5 -3.8 4.1 -0.6 2.7 1.9 -5.9 0.1 percent changes in level for the subjects in both groups: Construct and interpret a 90% confidence interval for the difference in mean percent change in polyphenol levels for the red wine and white wine treatments. Assume both populations follow a normal distribution. a) State the parameters of interest. b) Check the conditions for both populations. c) Name the procedure and find the confidence interval. d) Interpretation in context. e) Is there a difference between the two populations?Who owns ipods? As part of the Pew Internet and American Life Project, researches surveyed a random sample of 800 teens and separate random sample of 400 young adults. For the teens, 79% said that they own an ipod or MP3 player. For the young adults, this figure was 67%. Does the data give convincing evidence of a difference in the proportion of all teens and young adults who would say that they own an ipod or MP3 player? Construct and interpret a 95% confidence interval for the difference between the population proportions. a) State the parameters of interest. b) Check the conditions for both populations. c) Name the procedure and find the confidence interval. d) Interpretation in context. e) Is there a difference between the two populations