11.4 A company wants to model the relationship between its sales and the sales for the industry as a whole. For the following data, fit a straight line by the method of least squares.

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Company Sales Year y ($ million) Industry Sales x ($ million) 2002 0.5 10 2003 1.0 12 2004 1.0 13 2005 1.4 15 2006 1.3 14 2007 1.6 15