The forecasting staff for the Prizer Corporation has developed a model to predict sales of its air-cushioned-ride snowmobiles. The model specifies that sales S vary jointly with disposable personal income Y and the population between ages 15 and 40, Z, and inversely with the price of the snowmobiles P. Based on past data, the best estimate of this relationship is
a. If Y = $11,000, Z = $1,200, and P = $20,000, what value would you predict for S?
b. What happens if P is reduced to $17,500?
c. How would you go about developing a value for k?
d. What are the potential weaknesses of this model