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Name: In a study, 28 adults with mild periodontal disease are assessed befor
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Description: In a study, 28 adults with mild periodontal disease are assessed before and 6 months after implementation of a dental-education program intended to promote better oral hygiene. After 6 months, periodontal status improved in 15 patients, declined in 8

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a study, 28 adults with mild periodontal disease are assessed before and 6 months after implementation of a dental-education program intended to promote better oral hygiene. After 6 months, periodontal status improved in 15 patients, declined in 8, and remained the same in 5.

9.1 Assess the impact of the program statistically (use a two-sided test).

Suppose patients are graded on the degree of change in periodontal status on a 7-point scale, with +3 indicating the greatest improvement, 0 indicating no change, and −3 indicating the greatest decline. The data are given in Table 9.9.

9.2 What nonparametric test can be used to determine whether a significant change in periodontal status has occurred over time?

9.3 Implement the procedure in Problem 9.2 and report a p-value.

TABLE 9.9 Degree of change in periodontal status
Change score
Number of patients
+3
4
+2
5
+1
6
-1
4
-2
2
-3
2

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