A hypothesis test evaluating the effect of a treatmentI makes the theoretical assumption that if there is a treatment effect it will _____ . 0 have an average effect on the scores in the sample, and produce a sample mean that is close to the population mean. 0 decrease the scores in the sample. 0 have an average effect on the scores in the sample, and produce a sample mean that is unlikelv to be drawn from the population by random chance. 0 increase the scores in the sample