1. No
2. Use a control
3. LQ = 16-18 grams, UQ = 22-24 grams
4. 32%
5. Outliers; interquartile range
6. 3.688 cupcakes
7. -0.919
8. Pred. cupcakes = -0.2126 * age + 24.35
9. Plot residuals against age and check there's no pattern and SD appears constant; plot histogram of residuals and check for normality and lack of outliers
10. 31.2%
11. Association might be due to era, not age: it could be that the later you're born, the more cupcakes you'll eat *and then you'll continue to eat that many cupcakes for the rest of your life)
12. 75%
13. 25%
14. Advantages: often requires no new data collection; can reveal associations you wouldn't expect. Diasadvantages: can't prove causality; relationships you find might be flukes.
15. 120 pounds
16. 4.08 inches
17. [This is probably an unfair question.]
A B C
0 0 0
1 0 1
1 1 0
2 1 1
18. Median will be less than mean
19. 146/1296 or 11.3%. [This is harder than you'll get in the midterm, but the principle is important.]
20. 1/54145