a)
To find the type of the study.
a)
Answer to Problem 15E
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 no treatment was imposed on the subjects.
b)
To find whether the study is retrospective or prospective.
b)
Answer to Problem 15E
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 data collected before they were observed. Therefore, it is prospective study.
c)
To explain the subjects with their selection.
c)
Answer to Problem 15E
The people with and without depression.
Explanation of Solution
The subjects are 23 men and 48 women who going under depression and 9 men and 24 women who don’t have depression. Therefore, the selection method is not specified in this study.
d)
To find the parameter of interest.
d)
Answer to Problem 15E
The Frequency of crying during sad moments.
Explanation of Solution
In this study, the parameter of interest is the difference in crying response between depressed and nondepressed individual exposed to sad moments.
e)
To explain the nature and scope of the conclusion.
e)
Explanation of Solution
The selection or assignment is not random as it is observational study. Therefore, there is no way of knowing the difference between depressed and non-depressed groups.
Chapter 13 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
Additional Math Textbook Solutions
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