Thanks for your response. All of you are really helpful.
Erik
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On Wed, 4 Apr 2001, Erik <[EMAIL PROTECTED]> wrote:
> What is the p-value of a t-statistic significant (significant level
> shown by the software is p) in the wrong direction in an one-tailed
> test? Should we modified it to (1-p)? Or it is just p?
Well, first you need to be sure it's reportin
Most software packages set the default to a two-tailed test
on t-tests. For example, if df = 23 and t = 2.5, then p would be
reported as .02. That means .01 is being cut off by t=2.5 and .01
is being cut off by t= -2.5. You only care about half the reported
p. So you would say p=.01. BUT you
if you are talking about a t test for means ... most software would
automatically give a two tailed p value ... unless you specify otherwise
(which software usually will let you do)
here is the typical example
Two-sample T for C1 vs C2
N Mean StDev SE Mean
C1 10 25.70
Hi,
What is the p-value of a t-statistic significant (significant level shown by
the software is p) in the wrong direction in an one-tailed test? Should we
modified it to (1-p)? Or it is just p?
Erik
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