MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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To help assess the health risks of second-hand smoke, the levels of cotinine (a metabolite of nicotine) were measured in mmol/l in the urine of seven subjects prior to exposure to second-hand smoke and shortly after a two-hour exposure to secondary cigarette smoke. Did the exposure significantly increase the cotinine level? Assume cotinine levels are not normally distributed and analyze with an appropriate sign test.
**Cotinine Levels (mmol/l)**

This table presents cotinine levels in mmol/l for different subjects before and after a specific condition or intervention.

| Subject | Before | After |
|---------|--------|-------|
| 1       | 13     | 19    |
| 2       | 17     | 23    |
| 3       | 10     | 19    |
| 4       | 21     | 25    |
| 5       | 15     | 20    |
| 6       | 9      | 15    |
| 7       | 32     | 60    |

### Analysis

- **Subjects:** The table includes data for 7 subjects.
- **Cotinine Levels:**
  - Each subject's cotinine levels are measured before and after a certain condition.
  - There is an apparent increase in cotinine levels for each subject from the "Before" to the "After" measurement.

This data can be used to study the effects of particular interventions or exposures on cotinine levels in these individuals.
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Transcribed Image Text:**Cotinine Levels (mmol/l)** This table presents cotinine levels in mmol/l for different subjects before and after a specific condition or intervention. | Subject | Before | After | |---------|--------|-------| | 1 | 13 | 19 | | 2 | 17 | 23 | | 3 | 10 | 19 | | 4 | 21 | 25 | | 5 | 15 | 20 | | 6 | 9 | 15 | | 7 | 32 | 60 | ### Analysis - **Subjects:** The table includes data for 7 subjects. - **Cotinine Levels:** - Each subject's cotinine levels are measured before and after a certain condition. - There is an apparent increase in cotinine levels for each subject from the "Before" to the "After" measurement. This data can be used to study the effects of particular interventions or exposures on cotinine levels in these individuals.
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