Question: How would you write a general prediction equation for a quadratic functional form? (a) Suppose 5 was a valid value on the predictor. How would

How would you write a general prediction equation for a quadratic functional form?

(a) Suppose 5 was a valid value on the predictor. How would you make a prediction for this value of the predictor?

(b) What do the signifi cance and sign of the coeffi cient estimate for the quadratic term tell us?

(c) What are the formulas for calculating the slope at each level of X and for calculating the point at which the slope becomes zero?

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