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Calculate Variance Between Actual And Forecast Data

what is the formula to calculate variance in Excel between the actual data and the forecasted one?

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i have a dynamic list of numbers....currently 10 numbers in the list.

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i have the upper limit (=MIN(1,(mean+half width))
i have the lower limit (=MAX(0,mean-half width)
i have the mean (avg of all numbers)
i have the t value (TINV(alpha, (n-1)))
i have the half width (t value * SQRT of Var/N)

i just don't know how to get the VAR/N

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******** ******************** ************************************************************************>Microsoft Excel - Statistical Data.xls___Running: xl2002 XP : OS = Windows XP (F)ile (E)dit (V)iew (I)nsert (O)ptions (T)ools (D)ata (W)indow (H)elp (A)boutC13C14C16C18=
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