29 Jan INSTRUCTIONS: Answer all questions. Shad
STA2023
Chapter 2
INSTRUCTIONS: Answer all questions. Shade the correct answer in your scantron for each of the questions on the quiz.
1. The first two classes of a frequency distribution are 0-19 and 20-39. What is the class width?
(a) 19 (b) 10 (c) 19.5 (d) 9.5 (e) 20
2. The first two classes of a frequency distribution are 0-19 and 20-39. What is the class mid-point for the second class?
(a) 20.5 (b) 19.5 (c) 14.5 (d) 29.5 (e) 39.5
3. What characteristic of a data set can be better understood by constructing a histogram?
(a) Shape (b) Variation (c) Center (d) Outliers (e) position
The test scores of 45 students are summarized in the frequency table below
Score
Students
20-29
5
30-39
10
40-49
15
50-59
10
60-69
5
4. What is the lower limit for the second class?
(a) 39.5 (b) 29.5 (c) 34.5 (d) 39 (e) 30
5. What is the class width in the frequency table above?
(a) 9 (b) 10 (c) 24.5 (d) 34.5 (e) 20
6. What is the class mid-point for the class 40 –49
(a) 34.5 b) 44.5 (c) 39.5 (d) 49.5 (e) 40
7. What are the upper limits for the last class?
(a) 60 (b) 69 (c) 59.5 (d) 69.5 (e) 64.5
8. What are the upper and lower boundaries for the third class?
(a) 39.5 – 49.5 (b) 40.5 – 49.5 (c) 40 – 49 (d) 34.5 – 44.5
9. What is the relative frequency corresponding to the frequency of 15 for the third class?
(a) 15% (b) 35% (c) 66.6% (d) 33.3% (e) 37.5%
10. What is the modal class?
(a) 20-29 (b) 30-39 (c) 40-49 (d) 50-59 (e) 60-69
11. What values are represented in the stemplot below?
stem
leaves
4
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