Question: Q# 20. Assume that a specific time series forecasting model did not accurately predict the actual demand. Assume, further, that CFE (or RSFE) was found

Q# 20. Assume that a specific time series

Q# 20. Assume that a specific time series forecasting model did not accurately predict the actual demand. Assume, further, that CFE (or RSFE) was found to be zero; but MAPE was found to be 10%. Then, which of the following statements is true? a) The forecast has no bias but has a positive standard deviation of errors. b) The forecast has a positive bias and standard deviation of errors equal to zero. c) The forecast has no bias and has a standard deviation of errors equal to zero. d) The forecast has a negative bias and a positive standard deviation of errors. e) None of the above is true. Q# 21. A TS value of greater than zero and a MAD value of greater than zero imply that the forecast has: a) No bias and no variability of forecast error. b) A non-zero amount of bias and a non-zero amount of forecast error. c) No bias and a non-zero amount of forecast error variability. d) A non-zero amount of bias and no variability of forecast error. e) None of the above is true

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