In an Observational Study, Confounding Means

Multiple Choice

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.