14. Which of the following sample statistics are unbiased estimators insofar they target population parameters?
a. Range, standard deviation, median
b. Mean, variance, standard deviation
c. Mean, median, mode
d. Mean, variance, proportion
15. The events of being left-handed and being blue-eyed are:
a. Disjoint/mutually exclusive
b. Dependent
c. Independent
d. Normally distributed
16. If a given probability distribution has a mean of 7, a median of 6, a standard deviation of 3, and a variance of 9, what is the expected value?
a. 3
b. 7
c. 9
d. 6
17. As the sample size increases, the sampling distribution tends to become:
a. Normal
b. Standardized
c. Negatively skewed
d. Positively skewed
18. A population consists of the values 2, 4, 5, and 7. Find the mean of all the possible sample means.
a. 4.5
b. 4
c. 5
d. Not enough information to tell
19. For which of the following can the Central Limit Theorem be applied (n=sample size)?
a. n=29; population is not normally distributed
b. n=504; population is not normally distributed
c. n=23; population is normally distributed
d. Both b and c
20. The area below a density curve corresponds to:
a. Z-scores
b. Probabilities
c. Means
d. Both a and b