A baker is testing a new leavening process used in producing bread that is believed to reduce the caloric content of the bread. Loaves of bread were randomly sampled and analyzed for caloric content both before and after-the new leavening process was used. The results of the two samples are given in the table. New Process Old Process n1 = 100 n2 = 100 X1 = 120 X2 = 131 01 = 3 02 = 4 . Give the test statistic for the hypotheses Ho : MI - M2 = 0 against H1 : MI - M2