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The quarterly sales data (number of copies sold) for a college textbook over
the past three years are as follows:
Quarter

Yr 1

Yr 2

Yr 3

1

1690

1800

1850

2

940

900

1100

3

2625

2900

2930

4

2500

2360

2615

a. Show the four-quarter moving average values for
this time series. Plot both the original time series and
the moving averages on the same graph.
b. Compute seasonal indexes for the four quarters.
c. When does the textbook publisher experience the
largest seasonal index? Does this result appear to be
reasonable? Explain.

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