11. 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

The obtained value of the appropriate statistic is _________.

1. 3.13

2. 3.58

3. 3.14

4. 3.57

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

A major advantage to using a two condition experiment (e.g. control and experimental groups) is _________.

1. the test has more power

2. the data are easier to analyze

3. the experiment does not need to know population parameters

4. none of these are correct

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 (D) equals _________.

1. 0

2. 1

3. N

4. cannot be determined

In analyzing the results of the correlated t test, the _________ scores are analyzed.

1. standardized

2. raw

3. normalized

4. difference

Which of the following tests analyzes the difference between the means of two independent samples?

1. correlated t test

2. sign test

3. t test for independent groups

4. all of these

The t test for independent groups is a robust test.

True

False

In a repeated measures design the difference scores are used in the analysis, not the raw scores.

True

False

If a violation of the homogeneity of variance assumption occurs, it is always necessary to abandon use of the t test for an independent groups design.

True

False