Quiz: Measures of Variability

Use the data set below for questions 1 through 4.

2, 3, 3, 4, 6, 7, 8, 8, 8, 9, 10, 12

1. What is the range?
a. 5
b. 10
c. 12
2. What is the inter-quartile range?
a. 5
b. 6
c. 10
3. What is the variance?
a. 3.114
b. 9.697
c. 10
4. What is the standard deviation?
a. 3.114
b. 9.697
c. 10
5. If a data set has a standard deviation of 4, what is the variance?
a. –2 or 2
b. 2
c. 16
6. If a data set has a variance of 9, what is the standard deviation?
a. –3 or 3
b. 3
c. 81

Use the frequency and weight above in for questions 7 through 10.

7. What is the range?
a. 3
b. 6
c. 16
8. What is the inter-quartile range?
a. 3
b. 6
c. 15
9. What is the variance?
a. 1.697
b. 2.880
c. 3
10. What is the standard deviation?
a. 1.697
b. 2.880
c. 3
11. How is the range computed?
a. maximum-median
b. maximum-minimum
c. Q3-Q1
12. How is the inter-quartile range computed?
a. Q3-median
b. median-Q1
c. Q3-Q1

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