What of the following must be true for a chi square analysis to be valid?

A. Data must be normally distributed

B. No more than 20% of the cells can have an observed frequency of <5

C. No more than 20% of the cells can have an expected frequency of <5

D. Homogeneity of variance

E. No cell can have an expected count of zero

F. p value should be <0.05

G. No category of either variable should include more than 90% of the cases