Let (X1, Y1),...,...,(Xn, Yn) be a random sample from a bivariate normal distribution with parameters μx,μY, p.
Question:
H0: μx = μY versus H1: μx μY.
(a) Show that the random variables Wi = Xi - Yi are iid n(μw,Ï2w).
(b) Show that the above hypothesis can be tested with the statistic
Where
Furthermore, show
that, under H0, Tw ~ Student's t with n- 1 degrees of freedom. (This test is known as the paired-sample t test.)
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