In John's study, he knows that each participant had an equal probability of being placed into each of his conditions.John must have used________ .
A)external validity.
B)random assignment.
C)systematic sampling.
D)random sampling.

Question

Quizplus · Accepted Answer

Random assignment ensures that each participant has an equal chance of being placed in each condition, which reduces the risk of confounding variables and improves internal validity in the study. External validity, systematic sampling, and random sampling are not relevant to the method of participant assignment used in John's study.

In John's Study, He Knows That Each Participant Had an Equal