Liste below are the heights of fathers and sons. Find the value of r, and use a significance level of 5% to determine whether there is a significant linear correlation between the heights of fathers and those of their sons
height of father= 70, 69, 64, 71, 68, 66, 74
height of son= 62.5, 64.6, 69.1, 73.9, 67.1, 64.4, 71.1