Case Study 14-2A 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 18. Refer to Case Study 14-2. Using α = 0.052 tail, what do you conclude? a. retain H 0; the film has no effect on the frequency of tooth brushing b. reject H 0; the film affects the frequency of tooth brushing c. accept H 0; the film has no effect on the frequency of tooth brushing d. reject H 0; chance alone is a reasonable explanation of the data 19. (3 points) Calculate an effect size measure for Cohen’s d for the data in Case Study 14-2. Use the standard deviation from the baseline measure for your calculations. In this equation the numerator is the difference between two population means while the denominator can be the sd of either population Cohen’s d= µ1- µ 2 σ

Case Study 14-2 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....

Case Study 14-2

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

18. Refer to Case Study 14-2. Using α = 0.05_{2 tail}, what do you conclude?

a.	retain H ₀; the film has no effect on the frequency of tooth brushing
b.	reject H ₀; the film affects the frequency of tooth brushing
c.	accept H ₀; the film has no effect on the frequency of tooth brushing
d.	reject H ₀; chance alone is a reasonable explanation of the data

19. (3 points) Calculate an effect size measure for Cohen’s d for the data in
Case Study 14-2.

Use the standard deviation from the baseline measure for your calculations.

In this equation the numerator is the difference between two population means while the denominator can be the sd of either population

Cohen’s d= µ₁- µ
₂

Jun 05, 2022

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Case Study 14-2 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....

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