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

ABC 012 N 15 255 X2 354 126 549 288 T 10 T 20 T 30 SS 14 SS 30 SS 30

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.