1. Briefly explain the goal for defining and measuring variability.

2. What is the range for the following set of scores? (You may have more than one answer.) Scores: 6, 12, 9, 17, 11, 4, 14

3. In words, explain what is measured by variance and standard deviation.

4. Is it possible to obtain a negative value for variance or standard deviation?

5. Describe the scores in a sample that has a standard deviation of zero.

9. Calculate SS, variance, and standard deviation for the following population of N 5 5 scores: 2, 13, 4, 10, 6. (Note: The definitional formula works well with these scores.)

11. Calculate SS, variance, and standard deviation for the following population of N 5 7 scores: 8, 1, 4, 3, 5, 3,4. (Note: The definitional formula works well with these scores.)

15. Calculate SS, variance, and standard deviation for the following sample of n 5 8 scores: 0, 4, 1, 3, 2, 1, 1, 0.