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The table below shows the demand for Fidgets (they're like Widgets, only they're more active) over an 8-month period. Calculate a four-period moving...

1. The table below shows the demand for Fidgets (they're like Widgets, only they're more active) over an 8-month period. Calculate a four-period moving average forecast for September. Also evaluate the quality of the four-period moving average forecasting model by calculating the root-mean-square error for the data set. Note: Round all intermediate calculations to two decimal places.
Month Demand
Jan 10
Feb 11
Mar 5
Apr 8
May 6
Jun 11
Jul 5
Aug 11
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Economics-8087271.xls

1. The table below shows the demand for Fidgets (they're like Widgets, only they're more active) over an 8-month period. Calculate a four-period moving average forecast for September. Also evaluate...

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