Two Sample T Test Formula. It could be used to determine if a new teaching method has really helped teach a group of kids better or if that group is just more intelligent. Df pooled r1 r2 degrees of freedom for the two sample t test for samples in ranges r1 and r2 especially when the two samples have unequal variances i e.
Where and are the means of the two samples δ is the hypothesized difference between the population means 0 if testing for equal means s 1 and s 2 are the standard deviations of the two samples and n 1 and n 2 are the sizes of the two samples. Reject the null hypothesis that the two means are equal if. Dependent or paired two sample t test.
Once t test statistic value is determined you have to read in t test table the critical value of student s t distribution corresponding to the significance level alpha of your choice 5.
This is equal to the denominator of t in theorem 1 if b true default and equal to the denominator of t in theorem 1 of two sample t test with unequal variances if b false. Dependent or paired two sample t test. Video transcript instructor kaito grows tomatoes in two separate fields. Df pooled r1 r2 degrees of freedom for the two sample t test for samples in ranges r1 and r2 especially when the two samples have unequal variances i e.
