The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.)
x 21 17 8 21 10 20 11 5 17 19
y 29 35 29 31 17 32 32 22 26 19
(a) Find the equation of the line of best fit.
= + x
(b) Find se2.