Consider the gasoline purchases for the Spokane Transit
Authority given in Table 2. In Example 3, a five-week moving average is used to
smooth the data and generate forecasts.
a. Use Minitab to smooth the Spokane Transit Authority data
using a four-week moving average. Which moving average length, four weeks or
five weeks, appears to represent the data better? Explain.
b. Use Minitab to smooth the Spokane Transit Authority data
using simple exponential smoothing. Compare your results with those in part a.
Which procedure, four-week moving average or simple exponential smoothing, do
you
Consider the gasoline purchases for the Spokane Transit
Authority given in Table 2. In Example 3, a five-week moving average is used to
smooth the data and generate forecasts.
a. Use Minitab to smooth the Spokane Transit Authority data
using a four-week moving average. Which moving average length, four weeks or
five weeks, appears to represent the data better? Explain.
b. Use Minitab to smooth the Spokane Transit Authority data
using simple exponential smoothing. Compare your results with those in part a.
Which procedure, four-week moving average or simple exponential smoothing, do
you prefer for these data? Explain
example 3
Table 2
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