Suppose that you believe that a cubic relationship exists between the independent variable (of time) and the dependent variable Y. Which of the following would represent a valid linear regression model?
A) Y = b0 + b1 X, where X = time3
B) Y = b0 + b1 X3, where X = time
C) Y = b0 + 3b1 X, where X = time3
D) Y = b0 + 3b1 X, where X = time
E) Y = b0 + b1 X, where X = time1/3
A
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