For a study using a t test for independent means, with any given total number of participants, power is greatest when the participants are divided into __________ groups.
A)2 equal
B)3 equal
C)2 unequal
D)3 unequal

Question

Quizplus · Accepted Answer

Power is greatest when the participants are divided into 2 equal groups. This is because t tests for independent means are designed to compare the means of two groups, so having equal sample sizes in each group maximizes the ability to detect differences between the groups. In addition, equal sample sizes reduce variability and increase the precision of the estimate of the population standard deviation, further increasing power.

For a Study Using a T Test for Independent Means