Question: a. Fit a sales-response curve to the Crawford data,using a least-squares criterion. (Use percentagesrelative to the base case for the effort and salesmeasures.) What are

a. Fit a sales-response curve to the Crawford data,using a least-squares criterion. (Use percentagesrelative to the base case for the effort and salesmeasures.) What are the best values of the parame-ters a,b,c, and d ?b. What sales does the model in part (a) predict for aneffort of 115%?

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