4. Independent random samples were selected from two populations and the following results were gathered. Sample I Sample II *1 - 253 Xy = 240 5 - 23 5 = 20 n = 40 n = 45 Is there a difference between the two samples? Use a = .05 level of significance. Step 1) Step 2) Step 4) Step 5) Step 6) Step 7)