In a research study, if the null hypothesis is rejected in favor of the alternative hypothesis, then the conclusion is that the mean of scores of treated persons is in general lower than the mean of scores of untreated persons.

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If the null hypothesis is rejected in favor of the alternative hypothesis, it means that there is evidence to suggest that there is a difference between the two groups being compared. However, it is not necessarily the case that the mean of scores of treated persons is lower than the mean of scores of untreated persons. The direction of the difference (i.e. which group has the higher mean) is determined by the directionality specified in the alternative hypothesis.

In a Research Study, If the Null Hypothesis Is Rejected