My Math Forum Math : discrete probability distribution

 February 14th, 2016, 05:46 PM #2 Senior Member   Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics I think Y~Binomial(n = 8, p=0.5). Whether he correctly identifies a margarine cookie as margarine or mis-identifies it as butter doesn't affect Y.
February 14th, 2016, 06:36 PM   #3
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 Originally Posted by 123qwerty I think Y~Binomial(n = 8, p=0.5). Whether he correctly identifies a margarine cookie as margarine or mis-identifies it as butter doesn't affect Y.
So I just do
Variance= n*p*q
8*0.5*0.5 ?
That doesnt give me the right answer

 February 15th, 2016, 06:42 AM #4 Senior Member   Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics Can I know the numerical answer?
February 15th, 2016, 01:52 PM   #5
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Quote:
 Originally Posted by 123qwerty I think Y~Binomial(n = 8, p=0.5). Whether he correctly identifies a margarine cookie as margarine or mis-identifies it as butter doesn't affect Y.
p=4/9

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