# Modet Take the actual demand lor the same month last year and divide that by

Modet Take the actual demand lor the same month last year and divide that by s used as the weelly forecast for the same month this year. This technique was used to forecast eight weeks for this year, which are shown below along with the actual demand that oocumed The foilewing eight weeks show the forecast (ased on last year) and he demand that actualy oooumed FORECASTACTUAL WEEK DEMAND DEMAND 2 155 130 140 202 Comple the MAD offorecast enors. CRound your answers to 2 decimal places.) Weak MAD 眦 5眦 眦 眦 b. Using the RSFE congule the tracking signal (Round your answers to 2 decimal places Negative valuas should be indicabed by a minus sign Wmk Tracking n/t

a. Table for calculation of MAD is given below.

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MAD = sum of [( xi-xbar)] / n

Where xi is the value for any period ( i=1 to n) where n is the total no. of samples

Xbar is the average of all x values

 MAD for forecast errors Xbar Period 1 2 3 4 5 6 7 8 ForecastValue 155 155 130 132 132 142 152 140 Actual value 152 148 147 157 177 187 182 202 Error of forecast X 3 7 17 25 45 45 30 62 29.25 [Xi – Xbar] 26.25 22.25 12.25 4.25 15.75 15.75 0.75 32.75 sum = 130 MAD 16.25

b. Tracking signal = [ xi-xbar] /MAD = 130/16.25 =8

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