Refer to the fishery data in Example 12.17. The researcher wanted to determine if the modeling of the number of bass caught in the lake was altered by whether or not there is public access to the lake.
a. Fit a first- order model relating catch to residency, size, and structure with separate intercepts and slopes for those lakes with access and those without access (access is used as an indicator variable).
b. Display the fitted regression lines for lakes both with and without access.
c. Test at the α = .05 level whether there is a significant difference between the partial slopes for residency, size, and structure for the lakes with and without access.

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