A dependent random sample from two normally distributed populations gives the following results: n = 15 d-bar

Question:

A dependent random sample from two normally distributed populations gives the following results:
n = 15 d-bar = 25.4 sd = 2.8
a. Find the 95% confidence interval for the difference between the means of the two populations.
b. Find the margin of error for a 95% confidence interval for the difference between the means of the two populations.