In the July 1993 issue of Standard and Poors Industry Surveys the editors stated:4 The

Chapter 9, Problem 9.3.10

(choose chapter or problem)

In the July 1993 issue of Standard and Poors Industry Surveys the editors stated:4 The strength (of sales) of video games, seven years after the current fad began, is amazing . . . . What will happen next year is anything but clear. While video sales ended on a strong note last year, the toy industry is nothing if not cyclical. (a) Why might sales of video games be cyclical? (b) Does s(t) = a sin(bt), where t is time, serve as a reasonable model for the sales graph in Figure 9.23? What about s(t) = a cos(bt)? (c) Modify your choice in part (b) to provide for the higher amplitude in the years 19851992 as compared to 19791982. (d) Graph the function created in part (c) and compare your results to Figure 9.23. Modify your function to improve your approximation. (e) Use your function to predict sales for 1993.