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 company's claim that the drug lowers cholesterol levels. Assume the samples are random and dependent, and the populations are normally distributed.

Note: Improvement would mean before > after and before - after is positive.

Define

Hypotheses

Justify

Test statistic

Pvalue

Conclusion