Question: Suppose that, in a randomized experiment, the mean response from participants in the control group differs from the mean response from participants in the treatment

Suppose that, in a randomized experiment, the mean response from participants in the control group differs from the mean response from participants in the treatment group. One reason for this is that participants in the control group were treated differently than participants in the treatment group. The other possible reason why the mean response from participants in the control group differs from the mean response from participants in the treatment group is A.a ceiling effect B.Simpson's paradox C.random assignment error D.regression toward the mean

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