The sales of a local grocery chain, since 2008 are:
Year Y Sales ($ millions)
2008 12
2009 9
2010 7
2011 13
2012 13
For full marks use the coded method and round your answer to 1 decimal place.
a) Find the slope for the trend-line.
b) What is the intercept of the trend-line.
c) Determine the least squares trend-line.