In a t-test, what are tails?
We are trying decipher whether to use one or two tails in a t-test... what do
we do.. and what do they mean???? HELP Dave |
In a t-test, what are tails?
"Dave" wrote: We are trying decipher whether to use one or two tails in a t-test... what do we do.. and what do they mean???? HELP Dave It depends on what you are trying to prove. If you reckon that the subject is likely to be over (or under) the average then that is your hypothesis and you will go for a one tail test. At 95% confidence level that means that the subject will only be less than that in 1 out of twenty times. The 5% must all be in one tail of the Normal curve. In a two tailed test the results can be either above or below the average. 95% confidence is split 2½% below and 2½ above. Hope this helps Peter atherton |
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