In a two-group experiment, random assignment
A) insures lack of bias in the experiment
B) insures lack of bias in the long run
C) insures equality of the two groups
D) is important solely for statistical reasons

Question

Quizplus · Accepted Answer

Random assignment helps ensure that any differences between groups are due to chance, reducing bias in the long run, but it does not guarantee immediate equality or lack of bias in a single experiment.

In a Two-Group Experiment, Random Assignment