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

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.$)$

Obtain the error measures. $($Enter your responses rounded to two decimal places.$)$

Find the coefficient of determination $(r^2).$

The coefficient of determination $r^2=$

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