You have the following data:

$\backslash$table$[[$Season$/$Year$,$Data,Level,Trend,Season,Forecast$],[1,$ year $1,1\mathrm{.}5,-,-,\mathrm{.}728,-],[2,$ year $1,1\mathrm{.}6,-,-,\mathrm{.}771,],[3,$ year $1,3,2\mathrm{.}033,\mathrm{.}087,1\mathrm{.}501,],[1,$ year $2,1\mathrm{.}65,,,,],[2,$ year $2,1\mathrm{.}73,,,,],[3,$ year $2,3\mathrm{.}5,,,,]]$

$($a$)(4$ points$)$ Make a forecast for period $1,$ year $2.$ Calculate the error of your forecast.

$($b$)($BONUS$)$ Suppose $===\mathrm{.}4.$ Complete the level, trend, and season equations for period $1,$ year $2.$