Statistics Dependent T Test Formula. T test uses means and standard deviations of two samples to make a comparison. Sp n1 1 s12 n2 1 s22 n1 n2 2 where s12 and s22 are the sample variances.
A dependent t test is an example of a within subjects or repeated measures statistical test. Calculate the probability of observing the test statistic under the null hypothesis. Sp n1 1 s12 n2 1 s22 n1 n2 2 where s12 and s22 are the sample variances.
When you plug these numbers into the formula of the t test you come up with a value of 2 99.
If the p value that corresponds to the test statistic t with n1 n2 1 degrees of freedom is less than your chosen significance level common choices are 0 10 0 05 and 0 01 then you can reject the null hypothesis. Thus in the dependent t test related groups indicates that the same participants are present in both groups. Unlike the classic student s t test the welch t test formula involves the variance of each of the two groups s a 2 and s b 2 being compared. T m a m b s a 2 n a s b 2 n b.
