lol last min S2 help please! Watch

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posh_git
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#1
Report Thread starter 14 years ago
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hey plz could some one list like the steps to do a hypothesis test for discrete things like Binomial and Poisson?

1) set up the H0 and H1 (i get tht lol!)

thanks in advance!!!

matthew
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davidreesjones
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1) Set up the hypotheses - perhaps i am testing whether the random variable X which has a poisson distribution has a mean of lambda = 8 (Ho) or rather that it is greater (H1) - they normally give a situation - see whether sales have increased or something like that (let X be the number of items sold in an hour, then X~Po(lambda). Ho: lambda equals 8, H1: lambda greater than 8

2) You are given a piece of information - e.g. that 12 items have been sold in an hour. (take care here they may try to trick you - e.g. 12 sold in thirty minutes)

3)Then find the probability that evidence as "bad or worse" as this would be collected by chance. In this case find p(X>=12|lambda = 8) = 1 - .8881 (from tables) = 0.1119.

4) see if the result is "significant" - it is significant iff the probability that it (ie getting 12 sold in an hour) is less than the desigated significance level (normally 5%). in this case clearly it isn't

5) theyll always give a mark for interpreting - therefore there is insufficient evidence to suggest that sales have increased.
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posh_git
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Report Thread starter 14 years ago
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cheers! and i would do the same for binomial? i get every other part of S2 except 4 these silly things!!! aaaaaaaaaaaargggh lol
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