Question: 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 α=.05.

1. For the first test, assume the data are from an independent measures study using two separate samples.
2. For the second test assume the data are from a repeated measures study using the same sample of n=5 participants in both treatments.
3. Explain why the 2 point mean is significant for one test but not the other.

Treatment 1 treatment 2

10 11

2 5

1 2

15 18

7 9

M=7 M=9

SS=134 SS=150

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