# The Center for Urban Transportation Research (CUTR) at the University of South Florida conducted a survey of

## Question:

a. How many models are fitted at step 1 of the stepwise regression?

b. How many models are fitted at step 2 of the stepwise regression?

c. How many models are fitted at step 11 of the stepwise regression?

d. The stepwise regression selected the following eight variables to include in the model (in order of selection): x11, x4, x2, x7, x10, x1, x9, and x3. Write the equation for E(y) that results.

e. The model in part d was tested and resulted in R2 = .677. Interpret this value.

f. Explain why the CUTR analysts should be cautious in concluding that the "best" model for E(y) has been found.

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