15. Data collected on the yearly demand for 50-pound bags of fetilizer at wallace garden supply are shown in the following table. develop a 3-year moving average to forecast sales, Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1. Which metho do you think is best?

16. Develop a trend line for the demand for fertilizer in problem 15 using any computer software.

19. Sales of cool-man air conditioners have grown steadily during the past 5 years. The sales manager had predicted, before using the business started, that year 1's sales would be 410 air conditioners. Using exponential smoothing with a weight of a=.30, develop forecasts for years 2 through 6

\fProblem 15? Explain your answm. 23 19 Sales of CoolMan air conditioners have steadily during the past 5 years: gI'OWl'l YEAR SALES 450 495 5 18 563 584