Two Independent Groups If we do not randomly assign subjects to treatment conditions,
A)confounding may occur.
B)we will gain external validity.
C)the sample selected may be biased.
D)we will not be able to estimate effect size.

Question

Quizplus · Accepted Answer

Without random assignment, there is a risk that the groups may differ in ways that affect the outcome variable, resulting in confounding variables.

Two Independent Groups If We Do Not Randomly Assign Subjects