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t-tests

srg

New Member
I have t-test outputs from excell and need help interpreting:

If t stat 8.9

t crit 1.65 and 1.97 (one and two tail)

do I reject the null?
 

ericlind

New Member
There's a lot of "depends" here and I don't have enough information to help you draw a conclusion.


First things first:


Are you trying to see if some set of data is equal to, or different than, another set?


If equal, then you need to look at the 2-tail test

If different, then you need to look at the 1-tail test.


The T-value 8.9 is not sufficient to answer the question whether the sets of data are equal or different by itself; although yes, 8.9 is bigger than both 1.65 and 1.97.


You need to look at the P-Value to determine whether the difference is statistically significant.


Since you're using an Alpha coefficient of .05 (or said another way you want your answer with a 95% level of confidence), then the P-value must be less than .05 to be statistically significant.


If the P-Value for the tail type your testing is less than .05, then yes you should reject the null.
 
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