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Chapter 2. 연습문제

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Introductory Statistics
Second Edition
Sheldon M.Ross

Chapter 2. Describing Data Sets

목차

4. The following table gives the 1991 crime rate(per 100,000 population) in each state. Use it to construct a
8. The following data refer to the ages(to the nearest year) at which patients died at a large inner-city(nonbirthing) hospital :
12. Draw side-by-side stem-and-leaf plots of the student scores on the mathematics and verbal SAT examinations. Did the students, as a group, perform better on one examination? If so, which one?

본문내용

12. Draw side-by-side stem-and-leaf plots of the student scores on the mathematics and verbal SAT examinations. Did the students, as a group, perform better on one examination? If so, which one?

Verbal score
Stem Leaf
4 |90
5 |20, 28, 04, 30, 24
6 |05, 30, 20, 04, 46, 90
7 |20, 20

Methematics
Stem Leaf
4 |88, 75, 58
5 |05, 75, 76, 52, 50
6 |72, 06, 22, 65
7 |80, 04

->Stem and Leaf로 정확한 판별을 할 수는 없으나, 눈대중으로 보면 대부분의 학생들은 Mathematics 점수를 더 잘 받았다.

13. Draw a scatter diagram of student scores on the two examinations. Do high scores on one tend to goalong with high scores on the other?

Chapter 3. Using Statistics to Summarize Data Sets

Review Problems(chapter 2)

2. The following stem-and-leaf plot records the diastolic blood pressure of a sample of 30 men.
9 | 3,5,8,
8 | 6,7,8,9,9,9
7 | 0,1,2,2,4,5,5,6,7,8
6 | 0,1,2,2,3,4,5,5,
5 | 4,6,8

(a) compute the sample mean 평균 ≒ 71
(b) compute the sample median. = 73
(c) compute the sample mode. = 89
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