Question: Use the computer output for the radial keratotomy data of Problem 12 in Chapter 8, along with the additional output here, to answer the following

Use the computer output for the radial keratotomy data of Problem 12 in Chapter 8, along with the additional output here, to answer the following questions.
a. Perform the overall F test for the regression of Y on both independent variables. Interpret your result.
b. Perform variables-added-in-order tests for both independent variables, with X1 added first.
c. Perform variables-added-in-order tests for both independent variables, with X2 added first.
d. Provide a table of variables-added-last tests.
e. Which predictors appear to be necessary? Why?

Y Regressed on X1 and X2 Source DF Type 1 SS X1 X2 Mean Square F Value Pr>F 13.09841552 13.09841552 10.67 00020 4.52435640368 0.605 4.52435640 Source DFType ll X1 X2 l SS 12.43080596 4.52435640 Moan Square F Value Pr>F 12 43080596 10.12 0.0025 4.52435640 368 0.0605

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