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Using exponential smoothing, the demand forecast for time period $10$ equals the demand forecast for time period $9$ plus

$\backslash$alpha times $($the error in the demand forecast for time period $9)$

$\backslash$alpha times $($the demand forecast for time period $9)$

$\backslash$alpha times $($the observed demand in time period $9)$

$\backslash$alpha times $($the demand forecast for time period $8)$