Homework #17 Solutions
42. Source SS df MS F
Regression 300 1 300 54.0
Error 100 18 5.556
Total 400 19
a.
b. r2 = 300/400 = 0.75
c.
The
sign of r is negative because the sign
of b is negative.
43. a. Source SS df MS F
Regression 50 1 50 2.5556
Error 450 23 19.5652
Total 500 24
b. n = 25
c.
d. r2 = 50/500 = 0.10
44. a. Y¢ = 17.08 + 0.16(50) = 25.08
b.
45.
a.
n = 15
= 107
= 837
= 118.6
= 969.92
= 811.60
= 1.114
b. Y¢ = 11.2358 – 0.4667(7.0) = 7.9689
c.
d. r2 = 0.499. The number of bidders explains nearly 50 percent of the variation in the amount of the bid.
46. Download spreadsheet
a.
b. r2 = (0.466)2 = 0.2172