A researcher states that "anxiety decreased performance irrespective of the participants' motivation levels." This statement tells you that there was a(n)

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The statement suggests that anxiety had a direct and independent effect on performance, regardless of the participants' levels of motivation. This is consistent with a main effect of anxiety. There is no mention of an interaction between anxiety and motivation, nor does the statement imply a main effect of motivation or any indication of a Type I error being made.

A Researcher States That "Anxiety Decreased Performance Irrespective of the Participants