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# A medical researcher wants to determine whether exercising

ISBN: 9780073401331 38

## Solution for problem 9E Chapter 1.1

Statistics for Engineers and Scientists | 4th Edition

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Problem 9E

A medical researcher wants to determine whether exercising can lower blood pressure. She recruits 100 people with high blood pressure to participate in the study. She assigns a random sample of 50 of them to pursue an exercise program that includes daily swimming and jogging. She assigns the other 50 to refrain from vigorous activity. She measures the blood pressure of each of the 100 individuals both before and after the study.

a. Is this a controlled experiment or an observational study?

b. On the average, the subjects in the exercise group substantially reduced their blood pressure, while the subjects in the no-exercise group did not experience a reduction. The researcher concludes that exercise decreases blood pressure. Is this conclusion better justified’ than the conclusion in Exercise 8? Explain.

Step-by-Step Solution:
Step 1 of 3

Solution 9E

Step1 of 3:

We have an experiment in that A researcher wants to determine whether exercising can lower blood pressure. Researcher recruits 100 people with high blood pressure to participate in the study.

Here researcher assigns a random sample of 50 of them to pursue an exercise program that includes daily swimming and jogging and 50 to refrain from vigorous activity. Totally researcher  measures the blood pressure of each of the 100 individuals both before and after the study.

We need to find,

a).Is this a controlled experiment or an observational study?

b).On the average, the subjects in the exercise group substantially reduced their blood pressure, while the subjects in the no-exercise group did not experience a reduction. The researcher concludes that exercise decreases blood pressure. Is this conclusion better justified’ than the conclusion in Exercise 8? Explain.

Step2 of 3:

a).

Let us understand what is controlled experiment and what is observational study.

Consider,

Controlled...

Step 2 of 3

Step 3 of 3

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