Reflect on your understanding by working through these review questions.

1. What information does a contingency table provide?
2. What is statistical inference?
3. What is a chi-squared test used for?
4. What do p-values and confidence intervals tell you?
5. What is the difference between correlation and association?
6. What kind of variable are t-tests suited to and what does a t-test tell you?
7. What is the difference between a test of association and a test of significance?
8. Describe the purpose of a scattergram and the kinds of relationship it can illustrate.