Chapter 20, Problem 66E

a.

To determine

Check the assumptions and conditions for the inference.

b.

To determine

Find the 95% confidence interval for the difference in mean skull breadth between these two eras.

c.

To determine

Explain whether the data provide evidence that the mean breadth of males’ skulls changed over the period.

d.

To determine

Perform Tukey’s test for the difference in mean skull breadth between these two eras.

State whether the conclusion in Part (c) change.

e.

To determine

Perform rank test for the difference in median skull breadth between these two eras.