54. The following data (tensile strength, hardness) are for tensile strength (100 psi) and hardness (Rockwell E) of die-cast aluminum. Construct a scatter diagram and determine the relationship: (293, 53), (349, 70), (368, 40), (301, 55), (340, 78), (308, 64), (354, 71), (313, 53), (322, 82), (334, 67), (377, 70), (247, 56), (348, 86), (298, 60), (287, 72), (292, 51), (345, 88), (380, 95),

(257, 51), (258, 75).