The equation of the least squares regression line is modifyingabove y with caret equals 2.0233 x minus 2.3256 and the sum of squared residuals for this line is 0.7907. answer parts (). x 3 4 5 7 8 y 4 6 7 12 14 (a) predict the mean value of y if xequals12. modifyingabove y with caret equals 22 (round to one decimal place as needed.) (b) construct a 95% confidence interval about the mean value of y if xequals12.