試題詳解

Problem 7. (2.5 %) Consider two random variables X and Y, each taking values in {1,2,3}. Let their joint PMF be such that for any 1 ≤ x,y ≤ 3, 
Then,
(A) X and Y can be independent or dependent depending upon the strictly positive values
(B) X and Y are always independent
(C) X and Y can never be independent