George Caloz & Fr$$res$,$ located in Grenchen, Switzerland, makes luxury custom watches in small lots. One of the company's products, a platinum diving watch, goes through an etching process. The company has recorded etching costs as follows over the last six weeks:

$\backslash$table$[[$Week$,$Units,Total Etching$],[$Cost$,,]]$

For planning purposes, management would like to know the variable etching cost per unit and the total fixed etching cost per week.

Exercise $5$A$-5$ Part $2($Algo$)$

$2-$a$.$ Using the least$-$squares regression method, estimate the variable etching cost per unit and the total fixed etching cost per week.

$2-$b$.$ Express these estimates in the form $Y=a+bx.$