Stats: Modeling the World Nasta Edition Grades 9-12
Stats: Modeling the World Nasta Edition Grades 9-12
3rd Edition
ISBN: 9780131359581
Author: David E. Bock, Paul F. Velleman, Richard D. De Veaux
Publisher: PEARSON
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Chapter 13, Problem 9E

a)

To determine

To find the type of the study.

a)

Expert Solution
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Answer to Problem 9E

This is an observational study.

Explanation of Solution

First need to understand about the experimental study and observational study:

Experimental study: Assigning people or things to groups and applying some treatment to one group, while the other group does not receive the treatment.

Observation study: In an observational study, measure or survey members of a sample without trying to affect them.

This is an observational study because the treatment is not imposed on the subjects and results are based on observations.

b)

To determine

To find whether the study is retrospective or prospective.

b)

Expert Solution
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Answer to Problem 9E

Prospective study.

Explanation of Solution

There are two types of Observational study:

Retrospective: The data are collected from the past by going back in time.

Prospective: The data are collected in the future.

The subjects were identified first then traits were observed. Therefore, it is prospective study.

c)

To determine

To explain the subjects with their selection.

c)

Expert Solution
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Answer to Problem 9E

The subjects were random 200 men and women with moderately high blood pressure and normal blood pressure.

Explanation of Solution

I this study, the subjects were random 200 men and women with moderately high blood pressure and normal blood pressure. The selection process was not specified so not sure about the selection.

d)

To determine

To find the parameter of interest.

d)

Expert Solution
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Answer to Problem 9E

The memory and reaction time.

Explanation of Solution

In this study, the parameter of interest is difference in memory and reaction time scores between those who having normal blood pressure and who having moderately high blood pressure.

e)

To determine

To explain the nature and scope of the conclusion.

e)

Expert Solution
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Explanation of Solution

The selection or assignment is not random as it is observational study. Therefore, there is no any option to see high variable such as age, it might have been the cause of the study.

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