Question 2 (10 points) Using the summation notation, show that the population correlation coefficient can be represented as: a. the mean of the products of z-scores; b. ? = %!#$%!%# '%!"$(%!)"'%#"$(%#) " .

Question 2 (10 points) Using the summation notation, show that the population correlation coefficient can be represented as: a. the mean of the products of z-scores; b. p = Hxy-Hxly Hx2 - ( Hx)2 Hy2 - (My ) 2