Long$-$term forecasts are usually less accurate than short$-$term forecasts because

Question $40$ options:

short$-$term forecasts have more standard deviation of error relative to the mean than long$-$term forecasts.

long$-$term forecasts have a smaller standard deviation of error relative to the mean than short$-$term forecasts.

long$-$term forecasts have a larger standard deviation of error relative to the mean than short$-$term forecasts.

short$-$term forecasts have a larger standard deviation of error relative to the mean than long$-$term forecasts.