1. Ms. Winnie Lin's company sells computers. Monthly sales for a six-month period are as follows: MONTH SALES Jan Feb Mar Apr May Jun 18,000 22,000 16,000 18,000 20,000 24,000 a. Plot the monthly data on a sheet of graph paper. b. Compute the sales forecast for July using the following approaches: (1) a four-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 c. Which method do you think is the least appropriate? Why