Econometric Theory/t-Test

A t-test involves the computation of a t-statistic, which is then compared to the critical values of a t-distribution for a given significance level. A t-test is essentially the Z-statistic of a variable divided by the square root of an independent chi-square distribution divided by its own degrees-of-freedom. The resulting value is the t-statistic with the same degrees-of-freedom as the chi-squared distribution. Therefore, the t-statistic of would be: Numerator: Denominator: We know (as an implication of the last assumption of the CLRM) that Therefore, Therefore, putting it all together we get, Notes