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

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

For questions below use the following: A researcher suspects that increasing illumination increases motoric speed. A group of 7 subjects was randomly selected and tested on the Digit Symbol subtest of the WAIS-R IQ test. The same subjects were tested under three illumination conditions, low light, medium light and high light. Their scores under each condition were as follows: Subject \# Low Light Medium Light High Light 1 7 10 11 2 8 7 10 3 6 8 10 4 5 6 9 5 4 4 7 6 3 5 6 7 8 10 13 -What is the major research error in this study?

With the within-subjects ANOVA, when null is rejected at an alpha of .05, then

With a paired t, a significant correlation has the effect of reducing the value of the estimated standard error of difference.

Calculate a paired t on the following scores: Group 1 Group 2 15 22 12 21 8 17 3 15

The relationship between the size of the values for the estimated standard error of difference and the t ratio, is

For the t ratio, the only time a negative t value may occur is when

With ratio data, calculating the t ratio is identical with the procedures used on

Accepting Ho when it should have been accepted causes an increase in the

When there is a correlation across the rows, the within-subjects ANOVA results in a higher value than when there is no correlation across the rows.

In a repeated-measures design, with a separate control group that is not matched to the experimental group, the "change" scores should be

In comparing the between-subjects with the matched-subjects designs, the matched-subjects design should yield

Compared to the independent t, the paired t, on data which are really correlated, is