Construct a graph of the time series

Reference no: EM13995472

1. For the data of Exercise:

a. Obtain the centered moving average for N 5 4; for N 5 12.

b. When N 5 12 months, the centered moving average is relatively smooth compared to when N 5 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 5 12 should be so smooth?

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

	J	F	M	A	M	J
2007	4.5	4.7	4.7	5.0	5.0	4.4
2008	5.4	4.9	5.3	5.6	5.4	5.4
2009	5.8	5.8	6.6	6.5	6.2	6.7
	J	A	S	O	N	D
2007	4.7	4.9	4.6	5.4	4.8	5.2
2008	5.5	5.4	5.7	6.3	5.3	6.3
2009	6.7	6.7	6.9	7.4	6.6	7.4

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.

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

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

Reference no: EM13995472

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