Researchers recently conducted a study to determine whether the medication Paxil is effective in the treatment of depression.  Depression was measured using the Hamilton depression scale with the results below. Placebo Group:  Sample mean = 22.97, sample standard deviation = 3.55, n = 40 Paxil Treatment Group:  Sample mean - 19.91, sample standard deviation = 3.40, n = 40 Find the 95% confidence interval estimate for the difference between the two means. Specify which group you are using as group 1 and which group you are using as group 2. Identify the critical t-score for your margin of error.

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