Check my work 2 26 In a study of copper bars, the relationship between shear stress in ksi (x) and shear strain in % (y) was summarized by the least-squares line y= -20.00 + 2.56x. There were a total of n = 18 observations, and the coefficient of determination was r = 0.9111. If the total sum 2.85 of squares was Zi=1 (yi - y) = 234.19, compute the estimated error variance s. Round the answer to three decimal places. points eBook Hint Ask Print n References