A Subway franchise consisting of 12 shops wishes to predict its store sales

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1.   In the calculation of the equation of a regression line, does it matter which variable is the x or independent variable, and which is the y or dependent variable?  Try the below example 2 from page 501 and report back.

 

x

29.7

29.7

31.4

31.8

27.6

y

175.3

177.8

185.4

175.3

172.7

2.  Explain the 2.  Don't confuse the linear correlation coefficient r, with the coefficient of determination r2.  what is the difference