[數學] 有關統計學問題

Refer to the following table which contains the sales (in $

000) for a department store for the first ten months for the year. Month SalesJanuary 440February 480March 590April 400May 500June 550July 470August 500September 600October 5201) Using a three period moving average (i.e. MA(3)) as a forecasting method

what is the MAPE for this forecasting model _____%.2) Using simple exponential smoothing (with a smoothing constant of 0.2) as a forecasting method

what is the MSE for this forecast model?各位數學高手

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Usingthree period moving average TimeValuePerdictError/Actual1440248035904400503.33330.25833333355004900.026550496.66670.0969696977470483.33330.0283687948500506.66670.0133333339600506.66670.15555555610520523.33330.006410256The MAPE for this forecasting model 5.7897 %Using simple exponential smoothing (with a smoothing constant of 0.2) TimeValuePerdictErrorERROR-SQUARE14404400024804404016003590448142201644400476.476.45836.965500461.1238.881511.65446550468.89681.1046577.8588167470485.116815.1168228.51764228500482.093417.90656320.6448919600485.6748114.325213070.2623310520508.539811.4602131.3361474The MSE for this forecast model is 70.3145I have make theassumption that the forecasting value of January is equal to its actual value.
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