supply chain management

1. Ms. Winnie Lin's company sells computers. Monthly sales for a six-month period are as follows: a. Compute the sales forecast for July using the following approaches: (1) a three-month moving average; (2) a weighted three-month moving average using .50 for June, .30 for May, and .20 for April; (3) a linear trend equation; (4) exponential smoothing with a (smoothing constant) equal to .40 , assuming a February forecast of 18,000 . b. Which method do you think is the least appropriate? Why