1. Can the value of the range, standard deviation, or variance of a set of scores be negative? Explain.

2. Give the symbol for each of the following:

a. Mean of a sample

b. Mean of a population

c. Standard deviation of a sample

d. Standard deviation of a population

e. A raw score

f. Variance of a sample

g. Variance of a population

3. Calculate the mean, median, and mode for the following scores:

a. 5, 2, 8, 2, 3, 2, 4, 0, 6

b. 30, 20, 17, 12, 30, 30, 14, 29

c. 1.5, 4.5, 3.2, 1.8, 5.0, 2.2

4. The following scores resulted from a biology exam:

Scores	f	Scores	f
95-99	3	65-69	7
90-94	3	60-64	6
85-89	5	55-59	5
80-84	6	50-54	3
75-79	6	45-49	2
70-74	8

a. What is the median for this exam?

b. What is the mode?