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.

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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