Research Question: What is the combined effect of medication and diet on blood p

Question

Research Question: What is the combined effect of medication and diet on blood pressure in adult males?

A randomized, controlled experiment investigated this question using a random sample of 540 adult males as subjects. At the beginning of the study, researchers measured the blood pressure of all the subjects. Each subject was given a month's supply of either Drug A, Drug B, or a placebo, then was assigned to be on either a low-fat diet or a low-salt diet for that month-long period. At the end of the month, the researchers measured the blood pressure of each subject again, and compared the two blood pressure readings.

Which of the following is an explanatory variable in this study? Check all that apply.

-Blood pressure before the study

-Blood pressure after the study

-Difference in the two measurements of blood pressure

-Type of drug given

-Type of diet

Question 3

Select one answer.

10 points

A simple random sample of 1,240 adult Americans is selected, and each person is asked the following question:

In light of candidate Jones’s alleged criminal activity do you believe he should withdraw from the race?

67% of those surveyed agreed that he should withdraw. Which of the following is an appropriate conclusion about the results?

They probably overstate the percentage of people who favor his withdrawal because of the question’s wording.

They are reasonably accurate because the study used a large simple random sample.

-They probably understate the percentage of people who favor his withdrawal because of the question’s wording.

-They are inaccurate because of convenience sampling.

-They are inaccurate because of voluntary response.

Question 4

Select one answer.

10 points

When surveying subjects about sensitive or self-incriminating topics, what technique might be used to help ensure that individuals answer sensitive or self-incriminating questions honestly?

-Using randomized response

-Asking technically complex questions

-Using simple, direct questions

-Asking questions in random order

Explanation / Answer

1. D and E

2. A

3. A

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