Consider the following time series data. 34 : Week 1 2 5 6 Value 18 14 15 12 18 14 Using the average of all the historical data as a forecast for the next period, compute the following. (Round your answers to two decimal places.) (a) mean absolute error MAE = (b) mean squared error MSE = (c) mean absolute percentage error МАРЕ - X % (d) What is the forecast for week 7?

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