16. Interpret the values of r as 1, -1 and 0. 17. Why does rank correlation coefficient differ from Pearsonian correlation coefficient?
18. Calculate the correlation coefficient between the heights of fathers in inches
(X) and their sons (Y)
× 65
66
57
70
67
68
72
68
72
69
72
56
69
71
y 67
65
(Ans. R = 0. 603)
19. Calculate the correlation coefficient between X and Y and comment on their relationship:
-3
-2
Y
9
4
(Ans. R = 0)