Question

16. The following data are from an experiment comparing two treatments:

Treatment 1	Treatment 2
10	11
2	5
1	2
15	18
7	9
M = 7	M = 9
SS = 134	SS = 150

Assume that the data are from a repeated-measures experiment using the same sample of n = 5 subjects in both treatments. Calculate the difference score (D) for each subject and use the sample of difference scores to determine whether there is a significant difference between the two treatments. Again, use a two-tailed test with a = .05.

For the repeated measures analysis you did, which of the following is TRUE:

a.       the t you look up is on 8 degrees of freedom

b.      the t you compute is LESS than 2.776

c.       the treatment's effect is significant

d.      the treatment's effect is non-significant

Answer 1

Following table shows the calculations:

Treatment 1, X1	Treatment 2, X2	d=X1-X2	(d-mean)^2
10	11	-1	1
2	5	-3	1
1	2	-1	1
15	18	-3	1
7	9	-2	0
Total		-10	4

Correct option:

c.       the treatment's effect is significant