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Statistics
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Understanding Statistics in the Behavioral Sciences
Quiz 14: Students T Test for Correlated and Independent Groups
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Question 21
Multiple Choice
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.
Using a = 0.05 2 tail , what do you conclude?
Question 22
Multiple Choice
In the t test for independent groups, _________.
Question 23
Multiple Choice
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.
The obtained value of the appropriate statistic is _________.
Question 24
Multiple Choice
A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second month. The following data are obtained.
Assume you are evaluating H
0
using the t test. Using a = .05 2 tail , t crit = _________.
Question 25
Multiple Choice
In a correlated t test, if the independent variable has no effect, the sample difference scores are a random sample from a population where the mean difference score ( µ D ) equals _________.