$4$

A textbook publishing company has compiled data on total annual sales of its business textbooks for the preceding eight years:

$\backslash$table$[[$Year:$,1,2,3,4,5,6,7,8],[$Sales $(000)$:$,38\mathrm{.}70,44\mathrm{.}70,48\mathrm{.}50,50\mathrm{.}70,55\mathrm{.}10,59\mathrm{.}20,60\mathrm{.}30,68\mathrm{.}40]]$

$0056$:$24$

Q$-1.$ Select the correct data chart and fit an appropriate model to it$.$

$($Click to select$)v$

a$-2.$ Forecast the precedina elaht vears, and determine the forecast errors. $($Neciative onswers should be indicated bv a minus sian.