A health educator wants to evaluate the effect of a dental film on the frequency with which
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Question:
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
Difference 3 1 3 0 -1 3 3 2
Using alpha 0.052-tail , calculate a 95% confidence interval for the data.
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