The quadratic equation Y = a + bX +cX2 can be estimated using linear regression by estimating
A. Y = a + ZX where Z = (b + c)2
B. Y = a + bZ where Z = X2
C. Y = a + ZX where Z = (b + c)
D. Y = a + bX + ZX where Z = c2
E. none of the above will work
Answer: E
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