--- "Donald F. Burrill" wrote:
On Mon, 8 May 2000, Khai L. Lai wrote:
snip
> or
> H_0: d = 0
> H_a: d < 0
This is a not uncommon formulation, but is technically
incorrect since the possibility d > 0 is not represented in the set of
hypotheses. If the alternative is to be one-sided ( d < 0 in this
example), the null must also be one-sided (here, d >= 0 ).
***Technically incorrect? I'm not so sure. I just looked in stat books by 13
authors, to see how null and alternative hypotheses were presented in a one-tailed
testing situation. Most of my books are from the social sciences. Results:
1 texts presented hypotheses in the form of
Ho: d<=0
Ha: d>0
10 presented in the form of
Ho: d=0
Ha: d>0
2 presented both forms
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