Graded Homework 22
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This homework covers polynomial models, material that can be found in your course
packet on pages 110114.
Question #1
Based on
this
data on the experience (in years) and salary (in thousands of dollars) of
51 employees of a firm, answer the following questions using your results of the
sample linear regression of salary (dependent variable) on experience (independent
variable) and the corresponding residual plot.
1.
The scatterplot of salary on experience suggests that there is
A positive
curvelinear relationship
between salary and experience.
2.
Which one of the following seems to be an accurate representation of the
residual plot.
An Ushaped band.
3.
The residual plots of regressing experience (dependent variable) on salary
(independent variable) will
be the opposite of the residual plot from a
regression of salary on experience and exhibit an invertedU shape band.
4.
The value of R² you obtain from this regression is
0.784507379
5.
Now add an additional independent variable, called "experience2". Create this
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 Spring '08
 Petry
 Regression Analysis, general manager, independent variables, Overall Ftest, quadratic model, independent variable calles

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