Use the multiple regression output shown to answer the following questions.







a) Which variable might we try eliminating first to possibly improve this model?
b) What is R2 for this model?
c) Do we expect R2 to increase, decrease, or
remain the same if we eliminate the variable chosen in
part (a)?
c) What is the pvalue for ANOVA for the original
3predictor model?
d) What is the Fstatistic from ANOVA for this model?
Solution:
a) Which variable might we try eliminating first to possibly improve this model?
Answer: X1 because it has the largest pvalue among the independent variables.
b) What is R2 for this model?
Answer:
c) Do we expect R2 to increase, decrease, or
remain the same if we eliminate the variable chosen in
part (a)?
Answer: We would expect R2 to increase because we are
eliminating the most insignificant variable from the
model
c) What is the pvalue for ANOVA for the original
3predictor model?
Answer:
d) What is the Fstatistic from ANOVA for this model?
Answer:
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