In these equations, 5 , and sy are the standard deviations of variables x and y , respectively, while x and y are the means of those two variables. (See the Scientific Skills Exercise for Chapter 32 for more information about the correlation coefficient, mean, and standard deviation.)
Calculate the means (x and y) from data in the table. Next, fill in the (xi - x) and yi - y columns in the data table, and use those results to calculate the standard deviation 5x and sr .