Using the following time series data, respond to the following items. a. G raph the data. b.
Question:
Using the following time series data, respond to the following items.
a. G raph the data.
b. Based on the graph, describe the time series pattern.
c. For this time series, why is forecasting with a seasonally adjusted trend model appropriate?
d. E valuate a seasonally adjusted trend forecasting model. What is the MAD?
e. What are the quarterly indexes?
f. Forecast sales for future periods 17 through 20.
Transcribed Image Text:
Period Quarter Sales Period Quarter Sales 1 1 $ 867 1 $1,206 2 2 895 10 2 988 3 742 11 936 4 4 689 12 4 677 1 970 13 1 1,304 6. 2 834 14 2 1,040 3 788 15 1,078 4 793 16 4 938 17998
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a b The quarterly time series shows two patterns positive trend and seasonality The seasonality is indicated with quarter 4 always the lowest sales among quarters 1 2 3 and 4 in years 2 3 and 4 quarter 1 is the highest sales among quarters 1 2 3 and 4 In the first year Q1 is not the highest but close c A trend model is appropriate because we want to estimate the increasing change in sales per quarter A model with seasonal indexes is appropriate because we want to quantify the seasonal ...View the full answer
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Related Book For
Statistical Techniques In Business And Economics
ISBN: 9781260239478
18th Edition
Authors: Douglas Lind, William Marchal, Samuel Wathen
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