11.5 With reference to the preceding exercise, (a) construct a 95% confidence interval for , the elongation per thousand pounds of tensile stress; (b) find

11.5 With reference to the preceding exercise,

(a) construct a 95% confidence interval for β, the elongation per thousand pounds of tensile stress;

(b) find 95% limits of prediction for the elongation of a specimen with x = 3.5 thousand pounds.