Plot the quarterly sales data for each year what are the


ABC Corporation has given you the following information sales history.

Quarter   Demand

____________ 2012 2013 2016

1 10 12 17

2 20 25 32

3 15 17 19

4 9 10 15

a) Plot the quarterly sales data for each year

b) What are the trend and the seasonal index for each quarter?

c) Assume exponential, trend and seasonal smoothing with α = 0.2, β = 0.3 and γ = 0.4. Forecast the demand for the 2nd and 3rd quarter of 2017.

d) If actual demand during the 1 quarter of 2017 is 50, find the updated seasonality index, level and trend for 1 quarter 2017 and forecast the second quarter of 2017.

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Operation Management: Plot the quarterly sales data for each year what are the
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