The following data are from an experiment comparing three different treatment conditions:

A B C

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0 1 2

2 5 5

1 2 6

5 4 9

2 8 8

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T = 10 T = 20 T = 30

SS = 14 SS = 30 SS = 30

N = 15

ΣX² = 354

 

a.      If the experiment uses an independent-measures design, can the researcher conclude that the treatments are significantly different? Test at the .05 level of significance.

b.     If the experiment is done with a repeated-measures design, should the researcher conclude that the treatments are significantly different? Set alpha at .05 again.

c.      Explain why the analyses in parts a and b lead to different conclusions.

 

 

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