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

Week Units Etching Cost

1 10 $ 27

2 7 $20

3 12 $31

4 6 $20

5 8 $24

6 11 $30

Total 54 $ 152

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

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

Variable etching Cost ____

Fixed Etching cost _____

2-b. Express these estimates in the form Y = a + bX. _______