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 H0; the film has no effect on the frequency of tooth brushing b. reject H0; the film affects the frequency of tooth brushing c. accept H0; the film has no effect on the frequency of tooth brushing d. reject H0; chance alone is a reasonable explanation of the data
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 = 0.052 tail, what do you conclude?
|
a. |
retain H0; the film has no effect on the frequency of tooth brushing |
|
b. |
reject H0; the film affects the frequency of tooth brushing |
|
c. |
accept H0; the film has no effect on the frequency of tooth brushing |
|
d. |
reject H0; 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
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