William H. Knapp III

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1. What is the mean of the following set of observations: {30, 20, 30, 10}?

2. What is the median of the following set of observations: {30, 20, 30, 10}?

3. What is the mode of the following set of observations: {30, 20, 30, 10}?

4. What best describes the following set of observations: {30, 20, 30, 10}?
Asymmetric
Negative skew
Positive skew
Symmetric

5. What best describes the following set of observations: {30, 20, 30, 10}?
Amodal
Bimodal
Multimodal
Unimodal

6. What best describes the following set of observations: {30, 20, 40, 10}?
Amodal
Bimodal
Multimodal
Unimodal

7. Assuming there is already a mode, adding an extreme value to a data set will ______ affect the mode. (Pick the answer to make this statement true.)
Always
Never
Sometimes

8. Adding an extreme value to a data set will ______ affect the median. (Pick the answer to make this statement true.)
Always
Never
Sometimes

9. Adding an extreme value to a data set will ______ affect the mean. (Pick the answer to make this statement true.)
Always
Never
Sometimes

10. For any unimodal symmetric distribution: mean=median=mode.
True
False

11. For any symmetric distribution: mean=median=mode.
True
False

12. What ordering is commonly seen for strongly positively skewed distributions.
mean>median>mode
mean>mode>median
median>mean>mode
median>mode>mean
mode>mean>median
mode>median>mean

13. What ordering is typically seen for strongly negatively skewed distributions.
mean>median>mode
mean>mode>median
median>mean>mode
median>mode>mean
mode>mean>median
mode>median>mean

14. When plotting a histogram, which values serve as the edges for each bar?
Apparant limits
Real limits
Midpoints

15. If you took an infinitely large sample of some population and created a histogram with infinitely small bars and divided the frequencies by the total number of observations what would you get?
A bar graph.
A normal distribution.
A weighted midpoint figure.
The probability density function for the population.

16. A normal distrbution is? (check all that apply)
Skewed
Symmetric
Unimodal
What people are generally talking about when they say "bell-shaped curve".

17. What symbol is used to represent the mean of a population?
$$s$$

$$\bar{x}$$

$$\mu$$

$$\sigma$$

18. What symbol is used to represent the mean of a sample?
$$s$$

$$\bar{x}$$

$$\mu$$

$$\sigma$$

19. What word best describes the mean of a population?
Derivative
Estimate
Parameter
Statistic

20. What word best describes the mean of a sample?
Derivative
Estimate
Parameter
Statistic