1. The quarterly sales data (number of copies sold) for a college textbook over the past 3 years are as follows in the Table below: QUARTERLY SALES Year 1 Quarter Year 2 Year 3 1 16 18 18 9. 9. 11 3 26 29 29 4 25 23 26 a) Compute seasonal indexes for the 4 quarters. b) When does the textbook publisher experience the largest change in sales? Does this result appear to be reasonable? Explain. c) Using the information on seasonality, compare a 4-quarter moving average to trend projection model and an exponential smoothing with a smoothing constant of 0.2. d) Use the selected model to generate a forecast for sales for the first quarter of Year 4
1. The quarterly sales data (number of copies sold) for a college textbook over the past 3 years are as follows in the Table below: QUARTERLY SALES Year 1 Quarter Year 2 Year 3 1 16 18 18 9. 9. 11 3 26 29 29 4 25 23 26 a) Compute seasonal indexes for the 4 quarters. b) When does the textbook publisher experience the largest change in sales? Does this result appear to be reasonable? Explain. c) Using the information on seasonality, compare a 4-quarter moving average to trend projection model and an exponential smoothing with a smoothing constant of 0.2. d) Use the selected model to generate a forecast for sales for the first quarter of Year 4
ChapterP: Prerequisites
SectionP.6: The Rectangular Coordinate System And Graphs
Problem 2ECP
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Transcribed Image Text:1. The quarterly sales data (number of copies sold) for a college textbook over the
past 3 years are as follows in the Table below:
QUARTERLY SALES
Year 1
Quarter
Year 2
Year 3
16
18
18
9.
9.
11
3
26
29
29
25
23
26
a) Compute seasonal indexes for the 4 quarters.
b) When does the textbook publisher experience the largest change in sales?
Does this result appear to be reasonable? Explain.
c) Using the information on seasonality, compare a 4-quarter moving average to
trend projection model and an exponential smoothing with a smoothing
constant of 0.2.
d) Use the selected model to generate a forecast for sales for the first quarter of
Year 4.
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