a)
To find the type of the study.
a)
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 find whether the study is retrospective or prospective.
b)
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 explain the subjects with their selection.
c)
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 find the parameter of interest.
d)
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 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 any option to see high variable such as age, it might have been the cause of the study.
Chapter 13 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
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