Two Matched Groups Critics have challenged the internal validity of Brady's (1958) study of ulcers in monkeys.Select the design that allows us to compare "executive" and "nonexecutive" monkeys and prevents selection threat.
A)experimental group-control group design
B)multiple groups design
C)two experimental groups design
D)two matched groups design

Question

Quizplus · Accepted Answer

The two matched groups design is the best choice as it allows for the comparison of "executive" and "nonexecutive" monkeys while also preventing selection threat. In this design, the two groups are matched based on relevant variables (such as age, sex, and baseline health status) in order to control for extraneous variables that could affect the outcome. This helps to increase internal validity by ensuring that any differences observed are likely due to the treatment (being an executive monkey) rather than other factors.

Two Matched Groups Critics Have Challenged the Internal Validity of Brady's