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# Generate a 95% Confidence Interval

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8. 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 (n=75), Mean (SD) Total Serum Cholesterol = 185.0 (24.5); % Patients with Total Cholesterol < 200 78.0%.

Placebo (n=75) ,Mean (SD) Total Serum Cholesterol = 204.3 (21.8) ; % Patients with Total Cholesterol < 200 65.0%

Total Sample (n=150), Mean (SD) Total Serum Cholesterol = 194.7 (23.2) ; % Patients with Total Cholesterol < 200 71.5%

##### Solution Summary

95% Confidence Interval is generated.

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