Question: Montgomery et al . ( 1 9 9 0 ) give 4 years of data on monthly demand for a soft drink. These data are

Montgomery et al.(1990) give 4 years of data on monthly demand for a soft drink. These data are given in Table E4.5.
a. Make a time series plot of the data and verify that it is seasonal. Why do you think seasonality is present in these data?
b. UseWintersmultiplicativemethodforthefirst3yearstodevelop a forecasting method for this data. How well does this smoothing procedure work?
c. Make one-step-ahead forecasts of the last 12 months. Determine the forecast errors. How well did your procedure work in fore- casting the new data?

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