AP Stats Nationals Review. Data: Quantitative (Histogram, Stem & Leaf, Boxplots) versus...

AP Stats

Nationals Review

• Data: Quantitative (Histogram, Stem & Leaf, Boxplots) versus Categorical (Bar or Pie Chart)

• Boxplots: 5 Number Summary, IQR, Outliers???, Comparisons

• Center, Shape & Spread!• For Skewed Data use…median & IQR• For Symmetric data use…mean & SD

• Normal Model (68 - 95 - 99.7), SD & z-scores

• Scatterplots ~ direction, form & scatter– Variables: explanatory & response– Correlation: r, r-squared, strength & direction. Z-score

world versus slope.• Linear Model ~ equation, interpretation, residuals• Problems– Extrapolation, lurking variables– Outliers & influential points/leverage

• Re-Expression & Ladder of Powers

M.C. Tips

• Underline key words• Write out your procedure• Don’t Rush• Balance your time (2-3 min per ???)

F.R. Tips

• Do easier ???’s first• Answer the ??? Asked (underline)• If miss 1 part, answer a part you know• Inference: Conditions/Mechanics/Conclusion• Be concise• Verify conditions (not just a checklist)• 2 decimal places for z-scores, 4 for p-values• Context is King!!!