Author Question: A variable can have a confounding effect in a differential study only if A) It affects the scores ... (Read 32 times)

newbem · **on:** Aug 4, 2018

A variable can have a confounding effect in a differential study only if

A) It affects the scores on the dependent variable(s).
B) There is no difference between the groups on the variable.
C) There are at least three groups in the study.
D) There are several levels of the variable in question.

Question 2

The minimum number of groups required in differential research is

A) One.
B) Three.
C) Two.
D) Four.