A researcher conducts a repeated-measures study comparing two treatment conditio

Question

A researcher conducts a repeated-measures study comparing two treatment conditions with a sample of n = 25 participants and obtains a t statistic of t = 2.21. Which of the following is the correct decision about the null hypothesis?

A) Reject the null hypothesis with a = .05 but fail to reject with a = .01.

B) Reject the null hypothesis with either a = .05 or a = .01.

C) Fail to reject the null hypothesis with either a = .05 or a = .01.

D) cannot determine the correct decision without more information

Explanation / Answer

As

df = n - 1 = 24

and t = 2.21, then the P value for one tailed and two tailed tests, respectively, are

P(one tailed) = 0.018444905
P(two tailed) = 0.036889809

Hence, whether it be one tailed or two tailed, the answer is

A) Reject the null hypothesis with a = .05 but fail to reject with a = .01. [ANSWER, A]

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