Chapter 23, Problem 3E

To determine

To describe how the shape, center and spread of t -models change as the number of degrees of freedom increases.

Explanation of Solution

We have to find out that how the shape, center and spread of t -models change as the number of degrees of freedom increases. Thus, if the number of degrees of freedom increases so the sample size is increased. Therefore, as the sample size increases, the bell curve becomes closer to normal, the center does not change and the spread should become less spread out.