A study is considered internally valid if __________.
A) the experimental and control groups are treated differently from one another, except for experimental manipulation
B) all confounds have been measured
C) the experimental and control groups are treated identically, including experimental manipulation
D) all confounds have been eliminated

Question

Quizplus · Accepted Answer

Internal validity refers to the extent to which a study accurately tests the hypothesis or research question it intends to address. In order to achieve high internal validity, confounding variables must be eliminated. Therefore, choice D is the correct answer as it states that all confounds have been eliminated. While choice B states that all confounds have been measured, this alone does not ensure that they have been accounted for and eliminated. Choices A and C are incorrect as they both involve unequal treatment of the experimental and control groups, which can compromise internal validity.

A Study Is Considered Internally Valid If __________