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 1E

a)

To determine

To explain whether the study is experimental or not.

a)

Expert Solution
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Answer to Problem 1E

No, the study is observational.

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.

The study is not experimental because no treatment is imposed on the subjects. Hence, the study is an observational study.

b)

To determine

To explain the differences in score are not caused by differences in parental income.

b)

Expert Solution
Check Mark

Answer to Problem 1E

The difference might be due to lurking variables.

Explanation of Solution

First need to know about the lurking variable.

The lurking variable is not an explanatory variable but there is indirect effect on the relationship between the variables.

Therefore, in this study, the relationship between parental income and SAT score can be due to lurking variables present in the study. That’s why we cannot conclude that the differences in score are not caused by differences in parental income.

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