An engineer measures a dependent variable y and independent variables x 1 , x 2 , and
Question:
Of the following, which is the best next step in the analysis? Explain your reasoning.
i. Add interaction terms x1x2 and x2x3 to try to find more variables to put into the model.
ii. Add the interaction term x1x3 to try to find another variable to put into the model.
iii. Nothing needs to be done. This model is fine.
iv. Drop x1 and x3, and then perform an F test.
v. Drop x2, and then perform an F test.
vi. Drop the intercept (Constant), since it has the largest P-value.
Transcribed Image Text:
The regression equation is Y- 0.367 + 1.61 X1 - 5.51 X2 + 1.27 X3 Predictor Constant X1 X2 X3 Coef 0.3692 SE Coef 0.9231 1.3395 1.4959 1.9760 0.40 0.698 0.254 0.004 0.537 1.21 1.6121 5.5049 3.68 1.2646 0.64
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