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a)
To explain whether the survey is retrospective, prospective or an experiment.
a)
Answer to Problem 30E
It is a Prospective study.
Explanation of Solution
Given:
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.
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.
This survey is prospective as data is collected in the future.
b)
To find which test is appropriate.
b)
Answer to Problem 30E
Chi-square test of Independence.
Explanation of Solution
Given:
When we want to check whether the two variables are independent. Therefore, here research wants to check whether there is association between cancer and fish consumption. Hence, Chi-square test of Independence is appropriate.
c)
To explain whether there is evidence about association between cancer and fish consumption.
c)
Answer to Problem 30E
There is not sufficient evidence to support the claim of an association between cancer and fish consumption.
Explanation of Solution
The null and alternative hypotheses:
H0: There is no association between cancer and fish consumption.
Ha: There is association between cancer and fish consumption.
Using excel,
Therefore,
P-value = 0.2985
Decision: The p-value> 0.05, fail to reject H0.
Conclusion: There is not sufficient evidence to support the claim of an association between cancer and fish consumption.
d)
To explain whether the study proves eating fish does not prevent prostate cancer.
d)
Answer to Problem 30E
No.
Explanation of Solution
Given:
This survey is prospective as data is collected in the future. Therefore, there might be some lurking variables which affect on the results. So, there should be an experiment study to prove causation.
Chapter 26 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
Additional Math Textbook Solutions
Elementary Statistics
A First Course in Probability (10th Edition)
Elementary Statistics: Picturing the World (7th Edition)
Calculus for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
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