Thread: t - test

ive calculated T=5.4

and the t(11,0.05)=2.2010

does this mean we accept or reject the null because T is greater than t?

*EDIT: I have found that the null will be rejected for this example.*

In another example, I have found a negative T value (T=-4.3, t(13,0.05) = 2.1604) for a two tailed test, am I correct in thinking that this should just be treated as a positive value and therefore the null hypothesis is again rejected?

Originally Posted by keelejody

In another example, I have found a negative T value (T=-4.3, t(13,0.05) = 2.1604) for a two tailed test, am I correct in thinking that this should just be treated as a positive value and therefore the null hypothesis is again rejected?

If your level of significance (that is , alpha) is 0.05, then for a two-tailed test, you need to calculate t(13,0.025). You have calculated the correct thing but mistakenly wrote it as "t(13,0.05)".

Here |T| > t(13,.025). So you reject the null hypothesis.