T Test Formula Explained. Student t test is a statistical test which is widely used to compare the mean of two groups of. Df n 1 n 2 2 we subtract 2 because each of the two means we computed costs us one degree of freedom.
µ 1 µ 2 the two population means are not equal. Independent two sample t test. T is basically the standardized sample mean difference.
The t score formula for the welch t test is.
T test uses means and standard deviations of two samples to make a comparison. Mean 1 and mean 2 the average values of each of the sample sets s diff the standard deviation of the differences of the paired data values n. Right now this is our test statistic. N total number of values.
