Change the units. In the previous exercise bots were given in thousands and spam messages per day were recorded in billions. In Exercise 4.8 you created a data set using the actual values. For example, Srizbi has 315,000 bots and generates 60,000,000,000 spam messages per day.
(a) Find the correlation between bots and spam messages using this data set.
(b) Compare this correlation with the one that you computed in the previous exercise.
(c) What can you say in general about the effect of changing units in this way on the size of the correlation?