Extensive error variation within the groups of an experiment will.
A)increase the probability of a Type I error
B)result in a more detectable treatment effect
C)increase the power of a statistical test
D)decrease the power of a statistical test

Question

Quizplus · Accepted Answer

Extensive error variation within the groups of an experiment will decrease the power of a statistical test. This is because a large variation within the groups will make it more difficult to detect a significant difference between the treatment and control groups, even if such a difference exists. In addition, increased variation within the groups can lead to a higher chance of Type II errors, where a significant effect is missed due to insufficient statistical power.

Extensive Error Variation Within the Groups of an Experiment Will