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The quarterly sales data (number of copies sold) for a college textbook over the past three...

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Statistics

The quarterly sales data (number of copies sold) for a collegetextbook over the past three years follow.

Click on the datafile logo to reference the data.

quarter year 1 year 2 year 3  

1 1690 1800 1850

2 940 900 1100

3 2625 2900 2930

4 2500    2360    2615

e. Deseasonalize the time series (to 3decimals).

YearQuarterDeseasonalized Value
11
2
3
4
21
2
3
4
31
2
3
4

f. Compute the linear trend equation for thedeseasonalized data (to 1 decimal if necessary).
Deseasonalized Value =____ +____ Period

Compute the forecast sales using the linear trend equation (to 1decimal).

Forecast for quarter 1
Forecast for quarter 2
Forecast for quarter 3
Forecast for quarter 4

g. Adjust the linear trend forecasts using theadjusted seasonal indexes computed in part (c) (tothe nearest whole number).

Forecast for quarter 1
Forecast for quarter 2
Forecast for quarter 3
Forecast for quarter 4

Answer & Explanation Solved by verified expert
3.8 Ratings (704 Votes)
eThe following table shows the calculationsfUsing Excel obtain the    See Answer
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