067概率中等derivationshort
Identical Marginals Do Not Imply Independence
题目
Three cards are labeled , , and . One card is drawn uniformly at random. Let be the first number and the second number on the drawn card. (a) Compute , , , and . (b) Are the marginal distributions of and the same? (c) Are and independent? Verify by checking whether holds for all .
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你的答案
b
c_independence
P(X=1, Y=1)
P(X=1)P(Y=1)