4. To understand whether two sets of data are related it is useful to calculate the Pearson Coefficient ofCorrelation (r). a) Sketch a scatter diagram to show the approximate appearance

when two variables show a weak direct correlation. Suggest a value for r for such a correlation. b) Sketch a scatter diagram to show the approximate appearance when two variables show a strong inverse correlation. Suggest a value for r for such a correlation. c) What value for r indicates no correlation?