this eample is of t-test for comparing two means here mean1 = mean of FIFO and mean 2 : Mean of LIFO so here we use student t-test for comparision of 2 means to evaluate both methods in this procedure ans: Student t-test for comparision of means Solution this eample is of t-test for comparing two means here mean1 = mean of FIFO and mean 2 : Mean of LIFO so here we use student t-test for comparision of 2 means to evaluate both methods in this procedure ans: Student t-test for comparision of means.