Concept explainers
a)
To explain whether the study is experimental or not.
a)
Answer to Problem 2E
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 explain whether to conclude that shorter men are at higher risk for heart attack.
b)
Answer to Problem 2E
The effect 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 observational study, the effect lurking variables might be present in the study. That’s why we cannot conclude that the shorter men are at higher risk for heart attack.
Chapter 13 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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