Question
10. Suppose a car is chosen at random. Let X be the weight of the car...
10. 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.
|
X |
Y |
|
27 |
30 |
|
44 |
19 |
|
32 |
24 |
|
47 |
13 |
|
23 |
29 |
|
40 |
17 |
|
34 |
21 |
|
52 |
14 |
a. Find b (the slope of the line of best fit) ___________________
b. Find a (the y-intercept of the line of best fit) ___________________
Homework Answers
Answer #1
10.
Let X be the weight of the car (in hundreds of pounds) and let Y be the miles per gallon.
Regression Equation is Y=a+bX
n : sample size = 8
| X | Y | XY |  |
| 27 | 30 | 810 | 729 |
| 44 | 19 | 836 | 1936 |
| 32 | 24 | 768 | 1024 |
| 47 | 13 | 611 | 2209 |
| 23 | 29 | 667 | 529 |
| 40 | 17 | 680 | 1600 |
| 34 | 21 | 714 | 1156 |
| 52 | 14 | 728 | 2704 |
 =299 |
 =167 |
 =5814 |
 =11887 |
a. Find b (the slope of the line of best fit) -0.600702370500439
b. Find a (the y-intercept of the line of best fit) 43.3262510974539
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