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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

 

Statistics and Probability, Statistics

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