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Exercise $5$A$-5($Algo$)$ Least$-$Squares Regression $[$L$05-11]$

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$],[1,9,$Cost$],[2,6,25],[3,11,20],[4,5,30],[5,7,21],[6,14,21],[,52,$$$149$