Exam 15: Repeated-Measures and Matched-Subjects Designs Interval Data

Calculate a paired t on the following scores: Group 1 Group 2 8 6 7 6 4 4 8 2

Degrees of freedom are a direct function of the sample size for all statistical tests except the paired t.

With 20 pairs of interval scores, the paired t has 38 degrees of freedom.

Dividing the mean difference by the estimated standard error of difference always yields the

Using a repeated-measures design with a separate control group, helps to prevent

When analyzing interval data from a repeated-measures design with a separate control group, an independent t may be applied to the two sets of "change" scores.

For a given number of scores, the paired t has one-half the degrees of freedom of an independent t.

For the previous question, should Ho be rejected as a one-tail t? If rejected, state the alpha level.

When the correlation between two sets of interval measures is significant and positive, the value of the paired t will always be

When experimental research yields a significant correlation between pairs of scores, the experimental design was

The paired t may only be applied to experimental data when there are at least two independent variables.

For questions below, use the following: A researcher predicts that training on the balance beam reduces reading errors among learning disabled youngsters. A random sample of 9 children was selected from the population of learning-disabled children from a large metropolitan school district. They were all given a reading test and their errors recorded. They were then trained on the balance beam for one year, and again their error scores on the reading test recorded. The data follows: Subject \# Before After 1 12 10 2 12 10 3 2 1 4 6 4 5 6 5 6 7 7 7 10 9 8 9 8 9 11 8 -Calculate the appropriate statistical test.

Of the following research designs, the one(s) requiring active manipulation of the independent variable is (are) the

When equating subjects on a matched-subjects design, the researcher should choose some measure which is correlated with the

For the paired t, increasing the sample size always increases the Type 1 error.

For questions below, use the following: A researcher predicts that training on the balance beam reduces reading errors among learning disabled youngsters. A random sample of 9 children was selected from the population of learning-disabled children from a large metropolitan school district. They were all given a reading test and their errors recorded. They were then trained on the balance beam for one year, and again their error scores on the reading test recorded. The data follows: Subject \# Before After 1 12 10 2 12 10 3 2 1 4 6 4 5 6 5 6 7 7 7 10 9 8 9 8 9 11 8 -Had the researcher made an error and calculated an independent t, what value would have been obtained?

For the previous question, should Ho be rejected? If rejected, state the alpha level.

The paired t should not be used for the analysis of data from independent sample groups.

Calculate a within-subjects ANOVA on the following matched-subjects data: Group 1 Group 2 Group 3 1 2 3 3 4 5 5 6 7 7 8 9 10 10 11

For previous question , should Ho be rejected? If rejected, state the alpha level.