The article Electrical ImpedanceVariation withWater Saturation in Rock (Q. Su, Q. Feng, and Z. Shang, Geophysics, 2000:6875)
Question:
a. Fit the model y = β0 + β1x1 + β2x2 + β3x1x2 + ε. Compute the analysis of variance table.
b. Fit the model y = β0 + β1x1 + β2x2 + ε. Compute the analysis of variance table.
c. Fit the model y = β0 + β1x1 + ε. Compute the analysis of variance table.
d. Compute the F statistics for comparing the models in parts (b) and (c) with the model in part (a). Which model do you prefer? Why?
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