A Pharmaceutical Company Wishes to Test a New Drug with the Expectation

Essay

A pharmaceutical company wishes to test a new drug with the expectation of lowering cholesterol levels. Ten
subjects are randomly selected and pretested. The results are listed below. The subjects were placed on the
drug for a period of 6 months, after which their cholesterol levels were tested again. The results are listed
below. (All units are milligrams per deciliter.)Test the companyʹs claim that the drug lowers cholesterol levels.
Assume the samples are random and dependent, and the populations are normally distributed. Use α $\alpha = 0.01 .$ $$\begin{array} { l | c | c | c | c | c | c | c | c | c | c | } \text { Subject } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \\\hline \text { Before } & 195 & 225 & 202 & 195 & 175 & 250 & 235 & 268 & 190 & 240 \\\hline \text { After } & 180 & 220 & 210 & 175 & 170 & 250 & 205 & 250 & 190 & 225\end{array}$$