In an observational study, confounding means
A) having more than one response variable.
B) that the effect of the explanatory variable on the response variable changes for different categories of a third variable.
C) that the effects of several variables are tested at one time.
D) that the effect of the explanatory variable on the response variable can't be separated from the effect of other variables on the response.

Question

Quizplus · Accepted Answer

Confounding occurs when the relationship between the explanatory variable and the response variable is mixed with the effect of other variables, making it difficult to determine the direct effect of the explanatory variable on the response variable.

In an Observational Study, Confounding Means