Please complete the following questions: 1) Find the estimated standard error for the sample mean for for a sample with n =9 and SS = 1152 2) Find the t-values that form the boundaries of the critical region for a two-tailed test with alpha of .05 for for n = 15 3) To evaluate the effect of a treatment, a sample is obtained from a population (mean = 20). after treatment, the ns sample mean is found to be 21.3, with a variance (s2) of 9 diness a) assuming that the sample consists of n = 16, use a 2-tailed hypothesis test with alpha = .05 to determine whether the treatment effect is significant or not. (be sure to calculate the t-statistic and draw a bell-shaped curve with the critical regions highlighted) b) compute cohen's d. Is this is a small, medium, or large effect? oring c) compute percentage of variance explained (r?). explain what this means in a sentence. ect Zoom d) create a confidence interval with 90% confidence. explain what this means in a sentence. aluations