7. For a hypothesis test evaluating the effect of a treatment on a population mean, what basic assumption is made concerning the treatment effect? a. If there is a treatment effect, it will add (or subtract) a constant to every score. b. If there is a treatment effect, it will multiply (or divide) each score by a constant. c. If there is a treatment effect, the mean will stay the same. d. If there is a treatment effect, it will add (or subtract) a constant to the standard deviation

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