a). Coefficient of correlation is between -1 and +1 . How would you express it arithmetically?

b). define Karl pearson's method of calculating coefficient of correlation and spearman's rank difference method.

c). What are limits of correlation coefficient r ?

d). If r = +1 in one situation and r = -1 in the other, what kind of relationship exist between the variables X and Y ?

e). What are the limits of coefficient of rank correlation ?

f). If thje values of X and Y have been ranked and we compute correaltion between ranks of Xand Y, will this correlation be equal to the value of coefficient of rank correlation ?