THE QUESTIONS I NEED HELP WITH ARE IN RED BELOW

2. National Scan, Inc., sells radio frequency inventor tags. Monthly sales for a seven-month period were as follows: a. Plot the monthly data on a sheet of graph paper. b. Forecast September sales volume using each of the following: 1) The nave approach Nave approach is the last period's actuals are used as the current period without any adjustment. Previous actual value = present forecast value August Actual value =21 September Forecast =20 2) A five-month moving average Moving average =( Af 1, at 2, At, At 4Al5)/5 At-, August, at-2=July, at-3=June, at-4=may, at-5=April (20+22+18+20+15)/5 95/5 September Forecast =19 3) A weighted average using .60 for august, .30 for July, and .10 for June At-1=August, At 2= July, At-3=June (0.620)+(0.322)+(0.118) September Forecast =20.4 4) Exponential smoothing with a smoothing constant equal to .20 assuming a a March forecast of 19(000) NEED HELP WITH THIS ONE 5) A linear trend equation Y=a+bx Y=16.86+0.5x 16.86+0.50(8)=20.86 September Forecast =20.86 c. Which method seems least appropriate? Why? (hint refer to your plot from part a. d. Why does use of the term sales rather than demand presume