1. Semester GPAs are compared for seven randomly chosen students in each class level at Oxnard University. Do the data show a significant difference in mean GPAs? You will need to enter the data into Minitab.
GPA for Randomly Selected Students in Four Business Majors
Accounting: 2.48, 2.19, 2.62, 3.15, 3.56, 2.53, 3.31
Finance: 3.16, 3.01, 3.07, 2.88, 3.33, 2.87, 2.85
Human Resource: 2.93, 2.89, 3.48, 3.33, 3.53, 2.95, 3.58
Marketing: 3.54, 3.71, 2.94, 3.46, 3.50, 3.25, 3.20
a. At the 0.05 level of significance, determine if there is a difference in the mean GPAs by the four business majors. State your hypotheses and show all 7 steps clearly.
b. Give and interpret the p-value.
c. Should Tukey pairwise comparisons be conducted? Why or why not?
d. If appropriate, use Minitab to produce Tukey pairwise comparisons. make a few sentences with your conclusions from those comparisons.
e. Use Levene's test to determine if the assumption of homogeneity of variances is valid. Give hypotheses, test statistic, p-value, decision and conclusion. Use the 0.05 level of significance.
f. Verify with Minitab by attaching or including relevant output.