Refer to the Biology of Sport (Vol. 31, 2014) study of the physiological performance of top-level water polo players, Exercise 11.24 (p. 598). Recall that data for eight Olympic male water polo players were used to model y = mean heart rate as a straight-line function of x = maximal oxygen uptake. Find an estimate of s, the standard deviation of the error of prediction, on the MINITAB printout (p. 598). Give a practical interpretation of this value?