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2. Given the following sales data (in millions of dollars). Year Actual Sales Forecast sales 15 14.0 20 18.0 19 21.0 23 24.0 Calculate and

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2. Given the following sales data (in millions of dollars). Year Actual Sales Forecast sales 15 14.0 20 18.0 19 21.0 23 24.0 Calculate and interpret the following accuracy measures. (a) Mean error (ME) (2 marks) (b) Mean absolute error (MAE) (3 marks) (c) Mean squared error (MSE)

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