The following data are for calculator sales in units at an electronics store over the past nine$$ weeks:

$$

Week

Sales

Week

Sales

$1$

$47$

$6$

$56$

$2$

$45$

$7$

$65$

$3$

$41$

$8$

$55$

$4$

$51$

$9$

$62$

$5$

$55$

Use trend projection with regression to forecast sales for weeks $10$minus

$13.$

What are the error measures$($CFE$,$ MSE, sigma

$,$

$$MAD$,$ and$$ MAPE$)$ for this forecasting$$ procedure? How about r squared

$?$

Part $2$

Obtain the trend projection with regression forecast for weeks $10$minus

$13.$

$($Enter your responses rounded to two decimal$$ places.$)$

Period

$$Forecast$,$ Bold Upper F Subscript t

$10$

$64\mathrm{.}91$

$11$

$67\mathrm{.}29$

$12$

$69\mathrm{.}67$

$13$

$72\mathrm{.}05$