Construct a graph of the time series

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For the data of given Exercise:

a. Obtain the centered moving average for N = 4; for N = 12.

b. When N = 12 months, the centered moving average is relatively smooth compared to N = 4. Aside from the fact that it includes a greater number of months at a time, is there any other reason why the moving average with N = 12 should be so smooth?

Exercise
The following data describe the monthly volume for an urban courier service. Data are in thousands of pieces handled.

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a. Construct a graph of the time series. Does the overall trend appear to be upward or downward?

b. Determine the three-month and five-month centered moving average curves and superimpose each on the original time series.

Reference no: EM131409708

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