Which of the following refers to the problem introduced when the experimental and control groups are not assigned equiv alent subjects?
A) selection effect
B) regression effect
C) mortality effect
D) maturation effect

Question

Quizplus · Accepted Answer

The problem introduced when the experimental and control groups are not assigned equivalent subjects is known as selection effect. This may lead to biased results as the groups may differ in important ways at the outset of the study.

Which of the Following Refers to the Problem Introduced When