(a) The sample covariance for two equally-sized samples is given by: Sšv = (1; – 1) (98 – ) i=1 Show that S = SX +S-25%Y- (b) Find the numeric value of Sy (c) In light of the above: i. What is the difference between doing a two-sample test and a one-sample test using the differences? Specifically, what is ignored in the two-sample test? ii. What does the two-sample test assume that the one-sample test does not?
