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

$\backslash$table$[[$Week$,$Sales,Week,Sales$],[1,49,6,59],[2,45,7,64],[3,44,8,59],[4,51,9,61],[5,55,,]]$

Use trend projection with regression to forecast sales for weeks $10-13.$ What are the error measures $($CFE$,$ MSE, $,$ MAD, and MAPE$)$ for this forecasting procedure? How about $r^2?$

Obtain the trend projection with regression forecast for weeks $10-13.($Enter your responses rounded to two decimal places.$)$

$\backslash$table$[[$Period$,$Forecast, $F_t$