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Graded Homework 11
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This quiz covers the introduction to simple linear regression, material that can be found in
your course packet on pages 7781.
Question #1
This is the Odometer Reading example on slide 8 (page 78) 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
.
2.
The value of
is
14822.82
.
3.
The value of S
x
2
is
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

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