%u2022 %u2022 4.2

Year 1 2 3 4 5 6 7 8 9 10 11

Demand 7 9 5 9 13 8 12 13 9 11 7

a) Plot the above data on a graph. Do you observe any trend cycles

or random variations?

b) Starting in year 4 and going to year 12 forecast demand using a

3-year moving average. Plot your forecast on the same graph as

the original data.

c) Starting in year 4 and going to year 12 forecast demand using a

3-year moving average with weights of .1 .3 and .6 using .6 for

the most recent year. Plot this forecast on the same graph.

d) As you compare forecasts with the original data which seems to

give the better results? PX

%u2022 4.3 Refer to Problem4.2.Develop a forecast for years 2 through

12 using exponential smoothing with %u03B1 = .4 and a forecast for year 1 of

6. Plot your new forecast on a graph with the actual data and the naive

forecast. Based on a visual inspection which forecast is better? PX