Reference no: EM131508926
This problem contains 6 questions. Please answer each question in a different work sheet of the same Excel file. For example, you can answer question 1 in sheet 1, question 2 in sheet 2, etc.
The manager of the Petroco Service Station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor. The owner has accumulated the following data on demand for unleaded gasoline from sales during the past 12 months:
Month Gasoline Demanded (gal.)
October 800
November 725
December 630
January 500
February 645
March 690
April 730
May 810
June 1,200
July 980
August 1,000
September 850
a. Compute a 2-month moving average demand forecast for the months of December to September. Calculate MAD, MAPD and MSE.
b. Compute the optimal 2-month weighted moving average demand forecast for the months of December to September. Calculate MAD, MAPD and MSE.
c. Assume the demand forecast for October is equal to the actual demand of October, 800. Compute the optimal exponentially smoothed demand forecast for the months of November to September. Calculate MAD, MAPD and MSE.
d. Assume the demand forecast for October is 800 and trend for October is 0. Compute the optimal double exponentially smoothed demand forecast for the months of November to September. Calculate MAD, MAPD and MSE.
e. Compute linear trend line demand forecast for the months of October to September. Calculate MAD, MAPD and MSE.
f. Compare the five forecasting methods by using MAD, MAPD and MSE and indicate which method is the best fit for the data based on MAD, MAPD (or MAPE), and MSE, respectively.
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