The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the difference in mean total cholesterol levels between treatments.

	New Drug ()	Placebo ()	Total Sample ()
Mean (SD) Total Serum Cholesterol	185.0 (24.5)	204.3 (21.8)	194.7 (23.2)
% Patients with Total Cholesterol < 200	78.0%	65.0%	71.5%