The use of existing natural groups of participants often results in:
A)nonequivalent groups.
B)regression toward the mean.
C)many independent variables.
D)equal numbers of males and females.

Question

Quizplus · Accepted Answer

Using existing natural groups of participants may result in nonequivalent groups because the groups may differ in important ways that could affect the outcome of the study. For example, if a study on the effectiveness of a new medication is conducted on patients from different hospitals, the hospitals may have different patient populations with varying demographics, health conditions, and treatments that could affect the results.

The Use of Existing Natural Groups of Participants Often Results