Question: An operation analyst is forecasting this year's demand for one of his company's products based on the following historical data: (4 year ago Quantity sold

An operation analyst is forecasting this year's demand for one of his company's products based on the following historical data: (4 year ago Quantity sold was 1039), (3 year ago Quantity sold was 1236 ), (2 year ago Quantity sold was 1801 ) and the last year Quantity sold was 1965 . The previous trend line had predicted 1216 for three years ago, 1282 for two years ago and 1348 for last year. What was the mean squared error (MSE) for these forecasts?

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