I need help answering question B #5 and C and D.

the question is only one question, being #2. the parts within the question I need assistance with are C and D.

National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows: Month Sales (000 units) 19 Feb. Mar. 18 Apr. 15 May 20 Jun. 18 Jul. 22 Aug 20 a. Plot the monthly data on a sheet of graph paper. b. Forecast September sales volume using each of the following: (1) The naive approach (2) A five month moving average (3) A weighted average using .60 for August, 30 for July, and.10 for June (4) Exponential smoothing with a smoothing constant equal to 20, assuming a a March forecast of 19(000) (5) A linear trend equation c. Which method seems least appropriate? Why? (Hint: Refer to your plot from part a.) d. What does use of the term sales rather than demand presume? (-40) a=0.2 1-x=0 F =19 at should the use of sales data instead of e National Scan, Inc., sells radio frequency inventory tags. Monthly sales for a seven-month period were as follows: Month Sales (000 units) Feb. 19 Mar. 18 Apr. 15 May 20 Jun. 18 Jul. 22 Aug. 20 a. Plot the monthly data on a sheet of graph paper. b. Forecast September sales volume using each of the following: (1) The naive approach (2) A five month moving average (3) A weighted average using.60 for August, 30 for July, and .10 for June (4) Exponential smoothing with a smoothing constant equal to.20, assuming a a March forecast of 19(000) (5) A linear trend equation c. Which method seems least appropriate? Why? (Hint: Refer to your plot from part a.) d. What does use of the term sales rather than demand presume? uc CY