Use the in$-$sample forecast errors to compute MSE, MAD, and MAPE.

Note: Do not round intermediate calculations. Round final answers to $2$ decimal places.Make a forecast for period $21.$

Note: Do not round intermediate calculations. Round final answer to $2$ decimal places.Use the $3-$period moving average for making forecasts.

Note: Do not round intermediate calculations. Round final answers to $2$ decimal plt yt

$154$

$255$

$338$

$454$

$547$

$656$

$768$

$871$

$974$

$1088$

$1194$

$1294$

$1395$

$1494$

$1582$

$1682$

$1780$

$1870$

$1973$

$2062$