This data provides 715 observations on variable X1, X2, and X3. Use Excel or MegaStat for the questions below:
a. Conduct the z-test at the 0.05 level to see if the population means for X2 and X3 are equal.
b. Conduct a test at the 0.05 level to see if the variance of X2 and X3 are equal.
c. Test to see whether the variance of X1 is greater than 9. Conduct this test at the 0.05 level.
d. conduct a simple ANOVA test to see whether the means of X1, X2, X3 are equal. Conduct this test at the 0.05 level. How do the means differ?