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

Sales $(000)$: $38\mathrm{.}4044\mathrm{.}5048\mathrm{.}0053\mathrm{.}4056\mathrm{.}2057\mathrm{.}1062\mathrm{.}80$

$68\mathrm{.}10$

& $00$:$38$:$39$

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

Chart A

Chart B

y$=3\mathrm{.}923$x $+35\mathrm{.}911$

y$=4\mathrm{.}107$x$+34\mathrm{.}768$

eBook

$75\mathrm{.}0$

$70\mathrm{.}0$

$65\mathrm{.}0$

$60\mathrm{.}0$

$55\mathrm{.}0$

$50\mathrm{.}0$

$45\mathrm{.}0$

$40\mathrm{.}0$

$35\mathrm{.}0$

$30\mathrm{.}0$

Sales $(000)$

P$3\_32$algoa$5.$jpg

near $($Sales $(000))$

$75\mathrm{.}0$

$70\mathrm{.}0$

$65\mathrm{.}0$

$60\mathrm{.}0$

$55\mathrm{.}0$

$50\mathrm{.}0$

$45\mathrm{.}0$

$40\mathrm{.}0$

$35\mathrm{.}0$

$30\mathrm{.}0$

$-$ Sales $(000)$

$-$ Linear $($Sales $(000))|$

$1$

$2$

$3$

$4$

$6$

$6$

$7$

$8$

$($Click to select$)$ $

a$-2.$ Forecast the preceding eight years, and determine the forecast errors. $($Negative answers should be indicated by a minus sign.

Do not round intermediate calculations and round your final answer to $2$ decimal places.$)$