Scatter plots and correlation

What this note covers

1. Read a scatter plot as paired observations
2. Calculate and interpret Pearson’s r
3. Use r squared without claiming causation
4. Check unusual points and restricted ranges
5. Compare patterns in context
6. Make a correlation conclusion with limits
7. Worked paired data: calculate correlation and inspect the picture
8. Worked influence and restriction: why r changes across data views

8 sections · 10 key terms & formulas · 6 common mistakes