Question

What is an observational​ study?
A.
An observational study measures the value of the response variable without attempting to influence the value of either the response or explanatory variables.
B.
An observational study is a list of all individuals in a population along with certain characteristics of each individual.
C.
An observational study is when a researcher assigns individuals to a certain​ group, intentionally changing the value of an explanatory​ variable, and then recording the value of the response variable for each group.
GPT 3.5
A. An observational study measures the value of the response variable without attempting to influence the value of either the response or explanatory variables.

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