Friday

July 25, 2014

July 25, 2014

Posted by **qwerty** on Tuesday, March 4, 2014 at 11:37am.

Let X and Y be two binomial random variables.

a) If X and Y are independent, then X+Y is also a binomial random variable.

b) If X and Y have the same parameters, N and P , then X+Y is a binomial random variable.

c) If X and Y have the same parameter P , and are independent, then X+Y is a binomial random variable.

d) Suppose that E(X)=0 . Then, X=0 .

e) Suppose that E(X^2)=0 . Then, P(X=0)=1 .

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