Two Sample T Test Chart. United fans reported higher levels of stress m 83 sd 5 than found in the population as a whole t 48 2 3 p 026. Two sample t df t value p p value or.
The formula for the two sample t test a k a. T degress of freedom the t statistic p p value. 9 31 4 1 t test mu sample 1 mu sample 2 vs not.
In this formula t is the t value x 1 and x 2 are the means of the two groups being compared s 2 is the pooled standard error of the two groups and n 1 and n 2 are the number of observations in each of the groups.
Two sample t test performed when the two group samples are statistically independent to each other while the paired t test is used to compare the means of two dependent or paired groups. The consultant performs a 2 sample t test to determine whether there is a difference in the patient ratings between the hospitals. Calculate sample mean bar x frac x 1 x 2 x 3. Here are some examples.
