Use the following data for questions 36 thru 38 below: Hint (Calculate the missing values using the formula for determining error. ) Period 1 2 3 4 5 6 Actual Demand 445 420 435 450 Forecast 420 450 440 450 430 Error 25 10 -30 20 Absolute Value of Error What is the mean absolute deviation (MAD) for the six months of data? Absolute Percentage Error

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