What would you need to forecast year 10 using simple exponential smoothing with a year 3 forecast of 58 and α of 0.3?
A) Only the actual value for year 9 and the forecast for year 9.
B) Actual values for all years from 4 to 9.
C) A direct formula that calculates the year 10 forecast without needing any actual values from previous years.
D) The actual value for year 10 to calculate its forecast accurately.
