10.19 Consider the following data from two independent groups: Group 1: 97, 83, 105, 102, 92 Group 2: 111, 103, 96, 106

a. Calculate s 2 for Group 1 and for Group 2.

b. Calculate dfX, dfY , and dftotal.

c. Determine the critical values for t, assuming a two-tailed test with an alpha level of 0.05.

d. Calculate pooled variance, s 2 pooled.

e. Calculate the variance version of standard error for each group.

f. Calculate the variance and the standard deviation of the distribution of differences between means. g. Calculate the t statistic. h. Calculate the 95% confidence interval. i. Calculate Cohen’s d.