If we like to test
H0: Variance of electronic = Variance of utilities
H1: Variance of electronic ≠ Variance of utilities
Which one is the correct one?
a. We need to do Shapiro test with log transformed data.
b. Since we do not assume that both data are from a normal distribution, we need to do Shapiro test first to see that data are from a normal distribution.
c. We can do F test right away.
d. We need to do F test with log transform data.