(a)
To find: that this is an experiment or observational study, justify the answer.
(a)
Answer to Problem 48E
observation study
Explanation of Solution
This was an observation study where an observer analysis collects information about the concept results of a treatment about subjects where a subject is not monitored by the researcher when assigned to a treated group vs a control group. Here, the researchers have not assigned people to use cell phones or not.
(b)
To Explain: the conclusion on the basis of given information.
(b)
Answer to Problem 48E
No
Explanation of Solution
Nevertheless, this analysis cannot say that the risk of brain cancer would not rise with cell phones, since this research is an observational study and the purpose and effect cannot be inferred.
Chapter 4 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Essentials of Statistics, Books a la Carte Edition (5th Edition)
An Introduction to Mathematical Statistics and Its Applications (6th Edition)
Elementary Statistics: Picturing the World (7th Edition)
Introductory Statistics (10th Edition)
Statistical Reasoning for Everyday Life (5th Edition)
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