A researcher randomly assigns 30 participants each to two treatment groups. The study is conducted in two different but somewhat similar classroom settings. The ratings of internal validity on equivalence of participant characteristics and control of extraneous variables, would be:
A) Medium and medium
B) High and high
C) High and medium
D) Medium and high

Question

Quizplus · Accepted Answer

Random assignment helps ensure equivalence of participant characteristics, leading to high internal validity in this aspect. However, conducting the study in two different classroom settings introduces potential variability that might not be fully controlled, thus only medium control of extraneous variables.

A Researcher Randomly Assigns 30 Participants Each to Two Treatment