Assume That a Time-Series Forecast Is Generated for Future Demand

Multiple Choice

Assume that a time-series forecast is generated for future demand and subsequently it is observed that the forecast method did not accurately predict the actual demand.Specifically,the forecast errors were found to be: Mean absolute percent error = 10%
Cumulative sum of forecast errors = 0
Which one of the statements concerning this forecast is TRUE?

A) The forecast has no bias but has a positive standard deviation of errors.
B) The forecast has a positive bias and a 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 positive bias and a positive standard deviation of errors.