Appendix A Statistical Reasoning in Everyday Life

Describing Data

A-1 How do we describe data using three measures of central tendency, and what is the relative usefulness of the two measures of variation?

A-2 What does it mean when we say two things are correlated?

A-3 What is regression toward the mean?

Significant Differences

A-4 How do we know whether an observed difference can be generalized to other populations?

A-5 What are cross-sectional studies and longitudinal studies, and why is it important to know which method was used?