Anan Conducted an Experimental Study in Which Students Were Randomly

Multiple Choice

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.