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Question: problem using the residual sums of squares from exercise 10...

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Problem Using the residual sums of squares from Exercise 10, find the model indicated by forward selection. (Start with the model None, and identify the single-variable model that has the smallest residual sum of squares. Then perform an extra-sum-of-squares F -test to see whether that variable is significant. If it is, find the two-variable model that includes the first term and has the smallest residual sum of squares. Then perform an extra-sum-of-squares F-test to see whether the additional variable is significant. Continue until no F -statistics greater than 4 remain for inclusion of another variable.) DISPLAY 12.15 Data for Exercise 10 Residual sum of squares Degrees of freedom Model variables 8,100 6,240 5,980 6,760 5,500 5,250 5,750 5,160 27 26 26 26 25 25 25 24 None AB AC BC ABC

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