Lecture Worksheet #3
Name:_____________________________________
Section Number _______
1.
The following data was collected during the 2000 U.S. Census.
The data is the
Median income in the U.S. for different ages.
Age in years
(rounded to
the nearest 10)
20
30
40
50
60
70
Median
Income
22,000
40,000
46,000
53,000
42,000
20,000
a.
Enter the data into your calculator and draw a scatterplot.
Briefly describe the
shape of the data.
b.
Use your calculator to find a linear regression equation for the data. Make sure
that you store the model in Y1.
Write down the equation.
c.
Write down the values for r and RSq.
d.
What do the values of r and RSq tell you about this linear model?
e.
Plot the data along with the linear model and sketch it here.
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Based on the shape of the scatterplot and the fit of the linear model to the data, do
the values of r and RSq surprise you? Why or why not?
g.
Enter the predicted values into L3 and the Residuals into L4.
h.
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 Spring '08
 McLaughlin
 Statistics, Linear Regression, Regression Analysis, median income

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