$11\mathrm{.}4$ Class hands on practice: business application.

Gym outfitters sells and services exercise equipment such as treadmills, ellipticals, and stair climbers to gymnasiums and recreational centers. The company management would like to determine if there is a relationship between the number of minutes required to complete a routine service call, $y$ and the number of machines services, $x.$ A random of $12$ records revealed the following information concerning the number of machines serviced and the time to complete the routine service call. Based on the data, find the extimated regression model.

$\backslash$table$[[x,11,8,9,10,7,6,8,4,10,5,5,12],[y,115,60,80,90,55,65,70,33,95,50,40,110]]$