Test whether the significant difference between treatments.
The following data are from a research study comparing two treatment conditions. Do the data indicate a significant difference between treatments? Utilize a two-tailed test with ∝ = .05.
a. For the first test, suppose the data are from an independent-measures study using two separate samples.
b. For the second test, assume the data are from a repeated-measures study using the same sample of n = 5 participants in both treatments.
c. describe why the 2-point mean difference is significant for one test but not for the other.
|
Treatment 1
|
Treatment 2
|
|
10
|
11
|
|
2
|
5
|
|
1
|
2
|
|
15
|
18
|
|
7
|
9
|
|
M = 7
|
M = 9
|
|
SS = 134
|
SS = 150
|