12. A researcher conducts an independent-measures study comparing two treatments and reports the t statistic as t(30)  2.085. a. How many individuals participated in the entire study? b. Using a two-tailed test with   .05, is there a significant difference between the two treatments? c. Compute r 2 to measure the percentage of variance accounted for by the treatment effect.

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12. A researcher conducts an independent-measures study
comparing two treatments and reports the t statistic as
t(30)  2.085.
a. How many individuals participated in the entire study?
b. Using a two-tailed test with   .05, is there a
significant difference between the two treatments?
c. Compute r
2 to measure the percentage of variance
accounted for by the treatment effect.

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