Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?
A) When the means of the distributions are equal
B) When the means of the distributions are not equal
C) When the standard deviations of the distributions are not equal
D) When the standard deviations of the distributions are equal
Question 2
A joint probability distribution for discrete random variables X and Y is denoted by ________.
A) P(Xi, Yi) = Xi Yi
B) P(X = x, Y = y) = f(x, y)
C) P(X > Y) = f(x, y)
D) P(j(x), j(y))
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