Assume that the differences are normally distributed. Complete parts (a) through (d) below. Observation 1 2 3 4 5 6 7 8 X; 44.8 53.7 46.2 43.5 47.6 51.3 42.7 46.3 Yi 46.9 52.8 50.4 48.7 49.8 54.5 46.1 46.9 .. (a) Determine dj = X; - Y; for each pair of data. Observation 3 5 6 7 8 d; (Type integers or decimals.) (b) Compute d and sd. d=(Round to three decimal places as needed.) Sa =(Round to three decimal places as needed.) (c) Test if Ha 0 OB. Ho: Hd 0