When variables A and B are independent, the variance of A - B is equal to
A) the variance of A plus the variance of B.
B) the variance of A.
C) variance of A minus the variance of B.
D) it cannot be determined from the information given here.

Question

Quizplus · Accepted Answer

When two variables, A and B, are independent, the variance of their difference (A - B) is equal to the sum of their variances. This is because the variance of the sum or difference of independent variables is the sum of their variances.

When Variables a and B Are Independent, the Variance of a -