Refer to the data in the previous exercise.
a. Show all steps of a two-sided significance test of the null hypothesis that the population mean is equal for the two groups. Interpret results in context.
b. Based on the explanation given in the previous exercise, do you think that the sample was a random sample or a convenience sample? Why? (In practice, you should not place much faith in inferences using such samples!)

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Graduate schoo 15, 7, 15, 10, 5,5,2,3, 12, 16, 15, 37, 8, 14, 10, 18,3,25, 15, 5,5 No graduate school: 6, 8, 15, 6, 5, 14, 10, 10, 12,5