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Problem $3-20($Algo$)$

An analyst must decide between two different forecasting techniques for weekly sales of roller blades: a linear trend equation and the naive approach. The linear trend equation is Ft $=127+2\mathrm{.}0$t$,$ and it was developed using data from periods $1$ through $10.$ Based on data for periods $11$ through $20$ as shown in the table, which of these two methods has the greater accuracy if MAD and MSE are used? $($Round your intermediate calculations and final answers to $2$ decimal places.$)$

t Units Sold

$11144$

$12148$

$13149$

$14142$

$15152$

$16152$

$17155$

$18155$

$19159$

$20165$

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