Concept explainers
Sales OHaganBooks.com fits the cubic curve
to its weekly sales figures (see Chapter 3 Review Exercise 57; t is time in weeks), as shown in the following graph:
Week
a. According to the cubic model, what was the rate of increase of sales at the beginning of the second week
b. If we extrapolate the model, what would be the rate of increase of weekly sales at the beginning of the eighth week
c. Graph the function w for
d. By examining the graph, say why the choice of a quadratic model would result in radically different long- term predictions of sales.
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