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# T-Test - testing for significance

## T-Test - testing for significance - BioStatistics Forum

### T-Test - testing for significance - Post Questions and Discuss Biostatistics Programs and Stastistical Analysis Questions

#1
09-13-2006, 09:33 PM

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T-Test - testing for significance

I have a few statistics questions.

How does one use the T-test to test for significance?

Does it have to be less than p< 0.05 and why? Also do triplicates of the same experiment count towards your sample number?
#2
09-18-2006, 03:11 AM
Post-Doc

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Re: T-Test - testing for significance

I use EXCEL for student t-tests...

#3
02-02-2007, 01:34 AM
Pipette Filler

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Re: T-Test - testing for significance

somebody use p<0.05, somebody use even stringent criteria: p<0.01

It is equally saying, there is only 5% (or 1%) of chance that both set of data are coming from the same distribution. Therefore, is P<0.05, I am willing to accept 5% or risk (that I am wrong) to say that both set of data represent different distribution.

For example, 1,2,3,4,5,6,7,8,9,10 is one population, 7,8,9,10,11,....20 is another population, t-test will give you p value of < 0.0002, so it is pretty safe to say that they are different set of data.

However, if you throw a 200 in the second set, you p value is now 0.1245, with is saying you are not so sure about whether they are different anymore.

 Tags significance , testing , ttest

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