Aggregate forecasts are usually more accurate than disaggregate forecasts because
A) aggregate forecasts tend to have a larger standard deviation of error relative to the mean.
B) aggregate forecasts tend to have a smaller standard deviation of error relative to the mean.
C) disaggregate forecasts tend to have a smaller standard deviation of error relative to the mean.
D) disaggregate forecasts tend to have less standard deviation of error relative to the mean.
Answer: B
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