Author Question: If the coefficient of correlation r = 0 .80, the standard deviations of X and Y are 20 and 25, ... (Read 36 times)

vicky · **on:** Jun 24, 2018

If the coefficient of correlation r = 0 .80, the standard deviations of X and Y are 20 and 25, respectively, then Cov(X, Y) must be 400.
a. True
b. False
Indicate whether the statement is true or false

Question 2

The test for the equality of two population variances is based on the:
a. difference between the two sample variances.
b. ratio of the two sample variances.
c. sum of the two sample variances.
d. product of the two sample variances.