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The following data are from a research study comparing two treatment conditions. Do the data indicate a significant difference between treatments? Use a two-tailed test with ∝ = .05.
a. For the first test, assume 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. Explain 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
15
18
7
9
M = 7
M = 9
SS = 134
SS = 150
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