12th Edition

ISBN: 9780321836960

Author: Mario F. Triola

Publisher: PEARSON

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Chapter 9.4, Problem 18BSC

In Exercises 9–20, assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal.

18. Before/After Treatment Results 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 arc given in the accompanying table (based on data from “Essential Hypertension: Effect of an Oral Inhibitor of Angiotensin-Convening 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?

Subject	A	B	C	D	E	F	G	H	I	J	K	L
Before	200	174	198	170	179	182	193	209	185	155	169	210
After	191	170	177	167	159	151	176	183	159	145	146	177

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Chapter 9.4, Problem 17BSC

Chapter 9.4, Problem 19BSC

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Chapter 9 Solutions

Elementary Statistics

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Solution Summary: The author concludes that there is sufficient evidence to support the claim that Captopril is effective in lowering systolic blood pressure.

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