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Placement Test Practice — Statistics
Placement Test Practice — Statistics
Practice Test — 18 Questions
1. Mean of $4,6,10$
2. Median of $1,5,7,10$
3. Mode of $2,2,3,8$
4. Range of $9,11,18$
5. Probability of drawing an ace
6. If $P(A)=0.62$, find $P(A^c)$
7. State the 95% normal-rule interval for mean 40 and SD 3.
8. What does a random variable assign?
9. Define expected value in words.
10. What is the midpoint of $(24,30)$?
11. Which is more resistant to outliers, mean or median?
12. What does a small p-value suggest?
13. Does a 99% CI tend to be wider or narrower than a 90% CI?
14. Probability of two heads in two fair flips.
15. If events are independent, how do you find $P(A \cap B)$?
16. What does IQR measure?
17. What shape is the normal distribution?
18. What is a confidence interval estimating?
Show Answer Key
1. $\frac{20}{3}$
2. $6$
3. $2$
4. $9$
5. $\frac{1}{13}$
6. $0.38$
7. $34$ to $46$
8. A number to each outcome
9. Long-run average value
10. $27$
11. Median
12. Evidence against the null hypothesis
13. Wider
14. $\frac{1}{4}$
15. Multiply: $P(A)P(B)$
16. Spread of the middle 50% of the data
17. Bell-shaped and symmetric
18. A population parameter