A new drug is proposed to lower total cholesterol. A randomized

controlled trial is designed to evaluate the efficacy of the medication

in

lowering cholesterol. Thirty participants are enrolled in the trial and are

randomly assigned to receive either the new drug or a placebo. The

participants do not know which treatment they are assigned. Each

participant is asked to take the assigned tre

atment for 6 weeks. At the

end of 6 weeks, each patient's total cholesterol level is measured and the

sample statistics are as follows.

#2) A new drug is proposed to lower total cholesterol. A randomized controlled trial is designed to evaluate the efficacy of the medication in lowering cholesterol. Thirty participants are enrolled in the trial and are randomly assigned to receive either the new drug or a placebo. The participants do not know which treatment they are assigned. Each participant is asked to take the assigned treatment for 6 weeks. At the end of 6 weeks, each patient's total cholesterol level is measured and the sample statistics are as follows. Treatment Sample Mean Standard Size Deviation New Drug 15 195.9 28.7 Placebo 15 227.4 30.3 Is there statistical evidence of a reduction in mean total cholesterol in patients taking the new drug for 6 weeks as compared to participants taking placebo