Topic: Correlation and Regression
Lind D.A., Marchal W.G., and Wathen S.A. (2012), Statistical Techniques in Business and Economics, 15th International Ed., McGraw Hill [Chapter 13] Earlier edts are also suitable.
Waters, D., (2008) Quantitative Methods for Business,4th Ed., Financial Times, Prentice Hall [Chapter 9]
When we look at interval or ratio scale variables there is often a relationship, eg: price and quantity demanded; time spent
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