Chapter 4.1, Problem 4.21E

(a)

To determine

To find out all the values that a correlation r can possibly take.

Answer to Problem 4.21E

  $-1\le r\le +1$

Explanation of Solution

The correlation r can take on values between $-1\text{ and }+1$ (including).

(b)

To determine

To find out all the values that a standard deviation s can possibly take.

Answer to Problem 4.21E

It can take non-negative values.

Explanation of Solution

The standard deviation can only take on non-negative values, there is no further classification.