Consider the following actual $($Upper A Subscript t$)$ and forecast $($Upper F Subscript t$)$ demand levels for a commercial multiline telephone at Office$$ Max: Time Period t Actual Demand Forecast Demand

$145\mathrm{.}045\mathrm{.}00$

$242\mathrm{.}045\mathrm{.}00$

$358\mathrm{.}044\mathrm{.}10$

$446\mathrm{.}048\mathrm{.}27$