Construct a graph of the time series

Reference no: EM131409687

Given the degree-day data of given Exercise, (a) determine the monthly seasonal indexes for January through December, then (b) use these indexes to deseasonalize the original time series.

Exercise
According to the U.S. Energy Information Administration, a heating degree-day is a relative measurement of outdoor temperature that indicates how far the average daily temperature is below 65° Fahrenheit. The higher the number of heating degree-days, the greater the national demand for heating energy from sources like natural gas and electricity. The following monthly data show the number of heating degree-days from 1992 through 1995.

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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: EM131409687

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