TABLE 10-4 Two Samples Each of Size 25 Are Taken from Independent

TABLE 10-4
Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances.The first sample has a mean of 35.5 and standard deviation of 3.0 while the second sample has a mean of 33.0 and standard deviation of 4.0.
-In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?

A) a test for the equality of variances from 2 independent populations
B) a test for the difference between the means of 2 related populations
C) a test for the difference between the means of 2 independent populations
D) All of the above