Anan conducted an experimental study in which students were randomly assigned to either 10 minutes of read aloud, 10 minutes of silent reading, 10 minutes of writing, or 10 minutes of free time. She concluded that there were significant differences among groups with the read aloud group outperforming others on a standardized reading assessment. However, there were not actual differences among groups. Anan conclusion represents
A) a Type I error.
B) a Type II error.
C) both a Type I and a Type II error.
D) a correct decision.

Question

Quizplus · Accepted Answer

Anan's conclusion that there were significant differences among the groups, when in fact there were not, represents a Type I error. This is because she has falsely rejected the null hypothesis that there are no differences among the groups.

Anan Conducted an Experimental Study in Which Students Were Randomly