A researcher administers two different drugs (X and Y) at two different times of day (morning or evening). The researcher states that the effect that Drug X has on behaviour depends on the time of day that it is administered. You can conclude:

Question

Answer

That there is an interaction between Drug X and time of day

Answer

That there is a main effect for Drug X

Answer

That there is an interaction between Drug X and Drug Y

Answer

That there is a main effect for time of day

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A researcher administers two different drugs (X and Y) at two different times of...

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