Question: This problem refers to the pond ecology data of Chapter 5, Problem 20. a. Perform the overall F test for the multiple regression of copepod

This problem refers to the pond ecology data of Chapter 5, Problem 20.
a. Perform the overall F test for the multiple regression of copepod count on zooplankton and phytoplankton counts.
b. Perform variables-added-in-order tests for both independent variables, with zoo-plankton count added first.
c. Perform variables-added-last tests for the regression in part (a).
d. Which variables appear to be necessary? Why?

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