4) The director of the MBA program wishes to investigate if the average GPA of MBA students varies with the size of university (small, medium and large) and type of MBA (regular, professional and executive) program. In order to investigate this issue, the director randomly picked 4 universities for each of the 9 university type-MBA program combinations and collected the average GPA of the MBA students. The data is in MBA.sav. Does the mean GPA differ for the three sizes of the university? Does the mean GPA differ for the three types of MBA programs? Does the MBA type affect the mean GPA of the university size? State the appropriate hypothesis