Captopril is a drug designed to lower systolic blood pressure. When subjects were treated with this drug,

Question:

Captopril is a drug designed to lower systolic blood pressure. When subjects were treated with this drug, their systolic blood pressure readings (in mm Hg) were measured before and after the drug was taken. Results are given in the accompanying table (based on data from €œEssential Hypertension: Effect of an Oral Inhibitor of Angiotensin-Converting Enzyme,€ by MacGregor et al., British Medical Journal, Vol. 2). Using a 0.01 significance level, is there sufficient evidence to support the claim that Captopril is effective in lowering systolic blood pressure?

Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...