Elvin collected the scores of a random sample 43 students on the first exam in a certain class and their corresponding scores on the second exam in that class. Here is computer output from a least-squares regression analysis on his sample: Predictor Coef SE TP Coef Constant 6.985 6.65 1.05 0.3 First exam 0.881 0.11 8.29 0.00 S=13.2 R-sq=62.89% Assume that all conditions for inference have been met. Which of these is a 99% confidence interval for the slope of the least squares regression line?
a. 6.985 + 2.576(6.65)
b. 6.985 + 2.423(6.65)
c. 0.881 + 2.7(0.11)
d. 0.881 - 2.576(0.11)
