$4$

$(800\mathrm{.}05$:$38$

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Two different forecasting techniques were used to forecast demand for cases of bottled water in a store. Actual demand and the two sets of forecasts for seven periods are as follows:

$\backslash$table$[[,,$Forecast Demand$],[$Period$,$Demand,F$1,$F$2],[1,71,70,71],[2,75,72,71],[3,70,73,70],[4,72,74,71],[5,74,75,73],[6,76,77,78],[7,81,78,78]]$

a$-1.$ Calculate the MAD for each set of forecasts. $($Round the final answers to $2$ decimal places.$)$

a$-2.$ Which technique appears to the more accurate?

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b$-1.$ Calculate the MSE for each set of forecasts. $($Round the final answers to $2$ decimal places.$)$

b$-2.$ Which technique appears to be more accurate?

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c$-1.$ Calculate the MAPE for each set of forecasts. $($Round the final answers to $2$ decimal places.$)$