Concept explainers
To select the best option from the multiple choice question according to the given question.
Answer to Problem T4.3SPT
Option (d) is correct.
Explanation of Solution
An experiment imposes deliberately some treatment on individuals in order to observe their responses.
An observational study tries to gather information without disturbing the scene they are observing.
Thus we note that the given study uses records and thus is an observational study.
It is not possible to conclude cause and effect from an observational study because observational study always contain possible confounding. Thus, option (d) is correct option.
Chapter 4 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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