Question - Insomnia and pain, continued. Refer to the previous exercise.
(a) For each age category, compute a 95% confidence interval for the difference in mean scores.
(b) Does it appear that one age category has a larger difference in group means than the other? Explain your answer.
(c) Suppose that you decide to test whether these differences are statistically significant. Explain why it might not be appropriate to use two-sample t procedures here.