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Q. 4. A two year sales history by quarter for a seasonal product is given below.
Sales
Quarter First Year Second Year
1 30 42
2 48 58
3 60 74
4 35 44
a) Using Winter's method, forecast the quarterly sales for the third year.
b) Assume that the actual sales for the first quarter of year 3 is 48 units.
What is the revised forecast for the second quarter of the third year? Use a=?=?=0.2.
c) Assume the following actual sales occurred during third year.
Quarter Sales
1 48
2 70
3 95
4 50
What is the 95% confidence interval around a one-period forecast?
Sales of music stands at Johnny Ho music store in Columbus, Ohio, over the past 10 weeks are shown in the table below. a) Forecast demand for each week, including week 10, using
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