When a researcher concludes that there are no differences between the treatment and control groups in a study, and in fact, there were no differences between the conditions. The researcher is illustrating
A) Type I error.
B) Type II error.
C) both Type I and Type II error.
D) a correct decision.

Question

Quizplus · Accepted Answer

This is a correct decision, as the researcher has accurately identified that there are no differences between the treatment and control groups, and there were in fact no differences in the conditions being tested. Type I errors occur when the researcher rejects the null hypothesis (there are no differences) when it is actually true, and Type II errors occur when the researcher fails to reject the null hypothesis when it is actually false. Neither of these situations applies here, so the correct decision is D.

When a Researcher Concludes That There Are No Differences Between