"assume that the differences are normally distributed. complete parts (a) through (d) below.
observation 1 2 3 4 5 6 7 8
xi 51.4 45.5 45.6 50.9 52.8 52.6 54.2 47.7
yi 52.3 45.7 50.9 54.7 52.4 53.2 54.8 50.2
(a) determine di=xi−yi for each pair of data.
observation 1 2 3 4 5 6 7 8
di -2.7 -0.2 -4.6 -5.7 -2.4 -4.3 -0.1 -0.9
(b) compute d and sd."