Graded Homework 13
You have submitted this Homework 2 times (including this time).
You may submit this Homework a total of 40 times and receive full credit.
This homework will be due October 14 at 3am. This quiz covers the introduction to simple
linear regression, material that can be found in your course packet on pages 6569.
Question #1
This is the Odometer Reading example on slide 8 (page 66) of your course packet. Notice,
however that the price column has different values, so you will get different results than the
ones in the course packet.
A car dealer wants to find the relationship between the odometer reading and the selling
price of used cars. A random sample of 100 cars is selected, and the data recorded. The
necessary data is
here
.
Find the regression line.
1.
The value of
is
36009.45 = 36009.45
.
2.
The value of
is
14822.82 = 14822.82
.
3.
The value of S
x
2
is
43528689.66 = 43528689.66
.
4.
The value of cov(x,y) is (
Note that what excel gives you in a covariance matrix is
population covariance and here you need sample covariance. When you get
covariance from the excel matrix, multiply it by n and divide by n1 to get sample
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 Spring '08
 Petry
 Regression Analysis, 0.1%, 0.01%, 1.6134 thousand dollars, 40 million dollars

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