An examination designed to measure basic knowledge of American history was given to random samples of freshmen at two major universities, and their grades were

Use the U test at the 0.05 level of significance to test the null hypothesis that there is no difference in the average knowledge of American history between freshmen entering the two universities.

University A: 77, 72, 58,92,87,93,97,91, 70,98, 76,90, 62, 69,90, 78, 96, 84, 73, 80 University B 89. 74,45,5671.74, 94, 88, 66.62 88, 63, 88. 37, 63, 75, 78, 34, 75, 68