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Name: A health educator wants to evaluate the effect of a dental film on the
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Description: A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their

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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A health educator wants to evaluate the effect of a dental film on the frequency with which children brush their teeth. A random selection of 8 children are used for the experiment. First, a baseline of the number of times the children brush their teeth over a month's period is established. Next, the children are shown the dental film and again the number of teeth brushings are recorded for a month. The following data are recorded.

Subject	1	2	3	4	5	6	7	8
After film	28	29	25	30	25	27	28	24
Baseline	25	28	22	30	26	24	25	22

Assume you are evaluating H0 with the t test. The df for determining tcrit equal _________.

	1.	8
	2.	16
	3.	7
	4.	14

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