Choose the correct answers in measure of dispersion.

1. What is a disadvantage of the range as a calculation of dispersion?

a. Based on only two observations.

b. Can be distorted by a large mean.

c. Not in the same units as the original data.

d. Has no disadvantage

e. None of the above

2. Rank the measures of dispersion in terms of their relative computational difficulty from least to most difficult.

a. Mode, median, mean

b. Range, mean deviation, standard deviation

c. Variance, mean, deviation, range

d. There is no difference

3. Which of the following measures of dispersion are based on deviations from the mean?

a. Variance

b. Standard deviation

c. Mean deviation

d. All of the above

e. None of the above

4. What is the relationship between the variance and the standard deviation?

Variance is the square root of the standard deviation

i. Variance is the square of the standard deviation

ii. Variance is twice the standard of deviation

iii. No constant relationship between the variance and the standard deviation

iv. None of the above

5. What is the range for the sample of March electric bills amounts for all electric homes of similar sizes (to the nearest dollar):

 $212, $191, $176, $129, $106, $92, $108, $109, $103, $121, $175 and $194.

i. $100

ii. $130

iii. $120

iv. $112

v. None of the above