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#### The primary purpose of the mean absolute deviation (MAD) in forecasting is to: estimate the trend line

###### Operations Management

The primary purpose of the mean absolute deviation (MAD) in forecasting is to: estimate the trend line. eliminate forecast errors. measure forecast accuracy. seasonally adjust the forecast. remove random variations. A manager uses the following equation to predict monthly receip0ts: Yt - 40,000 + 150t. What is the forecast for Sep this year if t = 1 corresponds to Aug of last year? 41800 42600 41950 42500 42100 Given forecast errors of -30, -15, and +15m, the Mean Absolute Deviation (MAD) is? -10 15 10 20 60 Given actual demands of 80, 100, 75 and forecast errors of -20, -10, and +15 for the last three months, respectively, the Mean Absolute Percentage Error (MAPE) is? 18.33% 15% 55% 8.33% 4.67% Which of the following smoothing constants would make an exponential smoothing forecast equivalent to a naive forecast? 0 1 dividend by the number of periods 0.5 1.0 cannot be determined Suppose that the last four months of sales 8, 10, 15, and 9 units, respectively. Suppose further that the last four forecasts were 5, 6, 11, and 12 units, respectively. What is the Mean Absolute Deviation (MAD) of these forecasts? 2 -0 3.5 9 10.5 For a given product demand, the time-series trend equation is 53 - 4x. The negative sign on the slope of the equation: is a mathematical impossibility.

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