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 18 21 15 22 11 11 21 14 22 6
y 35 15 21 28 21 29 30 33 29 21
(a) Find the equation of the line of best fit.
Y = ___ + ___x
(b) Find Se^2.