use a t-distribution to find the confidence interval for the difference ud = u1-u2 using the relevant sample results from paired data. Assume the results come from random samples from populations that are approximately normally distributed, and that the differences are computed using d = x1-x2.
Test H0: ud = 0 vs Ha: ud not equal 0 using the paired difference sample results x^d = 13.20, sd = 11.4, nd = 25