Livestock Auctions 2

Describe the relationship between the cost of operations and the number of livestock sold at auction
Problem

A cost analyst was hired by a group of livestock auction market managers to determine how the number of various classes of livestock (cattle, calves, hogs, and sheep) sold at their markets influenced the cost of operations of their markets. Data was provided by 19 market managers.

Find the multiple linear regression function for expressing cost of operations as a function of the number of livestock sold for the four classes.
Sample Data

The Auction data set contains data from 19 livestock auction markets, including the number of head of each of four types of livestock sold (in thousands), the cost of operation of the auction market (in thousands of dollars), and the market identifier.