Long-term forecasts are usually less accurate than short-term forecasts because
A) short-term forecasts have a larger standard deviation of error relative to the mean than long-term forecasts.
B) short-term forecasts have more standard deviation of error relative to the mean than long-term forecasts.
C) long-term forecasts have a smaller standard deviation of error relative to the mean than short-term forecasts.
D) long-term forecasts have a larger standard deviation of error relative to the mean than short-term forecasts.
Answer: D
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