In Exercises, use Table VII to find the required χ2-values. Illustrate your work graphically. When you use chi-square procedures to make inferences about a population standard deviation, why should...

In Exercises, use Table VII to find the required χ2-values. Illustrate your work graphically.

When you use chi-square procedures to make inferences about a population standard deviation, why should the variable under consideration be normally distributed or nearly so?