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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.

1. Upper limit of CI: (2 points) 

2. Lower limit of CI: (2 points) 

3. Based on the confidence interval which of the following is (are) true? (4 points) 

a. There is significant evidence, alpha=0.05, to show that there is a difference in Total 

Serum Cholesterol between treatments New Drug and Placebo. 

b. There is not significant evidence, alpha=0.05, to show that there is a difference in 

Total Serum Cholesterol between treatments New Drug and Placebo. 

c. The difference between Total Serum Cholesterol between treatments New Drug and 

Placebo is essentially 0. 

d. b and c. 

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