1. A student scores 75, 80, 85, 90 on 4 tests. Score needed on 5th test for mean of 84:

2. A box contains 4 red, 3 green, 2 blue balls. P(red or green) =

3. A jar has 5 red, 4 green, 3 blue chips. P(not red)?

4. A scatterplot shows positive correlation. As x increases, y:

5. A car's fuel tank holds 50 liters. It currently has 30 liters. What percent is full?

6. Data: 2,3,5,7,11,13,17. If 100 is added to this dataset, the measure most affected is:

7. Data shows: for each $1 increase in price, 5 fewer units sold. Type of relationship:

8. If two regression models have R²=0.85 and R²=0.70 for the same data, the better predictive model is:

9. A Poisson process has rate λ=3 events/hour. P(0 events in 1 hour)=

10. A survey finds 15% of people have glasses. In a sample of 200, expected number with glasses:

11. Which graph best shows relationship between two variables over time?

12. For regression with one predictor, R²=r². If r=0.9, how much of y-variation is unexplained?

13. A scatterplot shows data with r=0.87. What percent of variation in y is explained by x?

14. A manufacturer tests 100 items: 92 pass. 95% CI for true pass rate:

15. A product costs $90 to make and is sold for $135. Profit margin (on selling price):

16. Two events A and B. P(A) = 0.4, P(B|A) = 0.6. P(A∩B) =

17. A Type II error (β) is reduced by:

18. The z-score for a value x=65 in distribution μ=55, σ=5 is:

19. In a class of 32 students, 8 got an A. Probability of selecting a student who got an A:

20. For a dataset, Q1=18, Q3=34. A value of 60 is:

21. Random variable X: P(X=0)=0.3, P(X=1)=0.5, P(X=2)=0.2. E(X²)=

22. The Central Limit Theorem requires which assumption?

23. The Cramer-Rao lower bound gives a lower bound for the variance of:

24. A linear model predicts test score from study hours: score = 8×hours + 40. For 5 hours, predicted score:

25. A systematic sample selects every 10th person from a list of 1000. Sample size is:

26. A factory output model: Q=50L-2L², L=workers. Output-maximizing workers:

27. Simpson's paradox occurs when:

28. A survey of 500 shows 60% satisfied. Best estimate of satisfied in city of 80,000:

29. Two fair coins are flipped. Given that at least one head appears, P(both heads)=

30. A study finds students who eat breakfast score 8 points higher on tests. This is an observational study. This means: