A.If expected frequencies are not all​ equal, then we can determine them by E=np for each individual​ category, where n is the total number of observations and p is the probability for the category.

B.If expected frequencies are​ equal, then we can determine them by E=

n/k​, where n is the total number of observations and k is the number of categories.

C.Expected frequencies need not be whole numbers.

D.​Goodness-of-fit hypothesis tests may be​ left-tailed, right-tailed, or​ two-tailed.