17 It is believed that the purity of oxygen (y) produced in a chemical distillation process, and the percentage of hydrocarbons (r) present in the main condenser of the distillation unit, are linearly related. Given the following information: 20 20 20 20 20 = 23.92, y = 1843.21, r = 29.2892, 29.2892, = 170044.5321. = i=1 i=1 i=1 i=1 === i=1 2214.6566 A What is the upper bound of a 95% confidence interval for the average increase in the hydrocarbon percentage when the purity level of oxygen increases by one unit? y = 74.283214. 9475x (a) 17.714 (b) 12.181 (c) 77.631 (d) 70.936 (e) 15.739 Sxy = 10.1774 = 0.05 14.1975 = ( )( 18056 06836