Do heavier cars really use more gasoline? Suppose a car is chosen at random. Let x be the weight of the car (in hundreds of pounds), and let y be the miles per gallon (mpg).
x | 27 | 43 | 32 | 47 | 23 | 40 | 34 | 52 |
y | 29 | 22 | 22 | 13 | 29 | 17 | 21 | 14 |
Complete parts (a) through (e), given Σx = 298, Σy = 167, Σx^{2} = 11,800, Σy^{2} = 3745, Σxy = 5833, and
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Σx = | |
Σy = | |
Σx^{2} = | |
Σy^{2} = | |
Σxy = | |
r = |
x | = | |
y | = | |
= | + x |
r^{2} = | |
explained | % |
unexplained | % |
x | 1 | 4 | 5 | 6 |
y | 51 | 44 | 33 | 26 |
r^{2} = | |
explained | % |
unexplained | % |
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