For a repeated-measures study comparing two treatments with n = 26 scores in eac

Question

For a repeated-measures study comparing two treatments with n = 26 scores in each treatment, the data produce t = 2.13. If the mean difference is in the direction that is predicted by the researcher, then which of the following is the correct decision for a hypothesis test with = .05

a. Reject H0 for either a one-tailed test or a two-tailed test.

b. Fail to reject H0 for both a one-tailed test and a two-tailed test.

c. Reject H0 for a two-tailed test but not for a one-tailed test.

d. Reject H0 for a one-tailed test but not for a two-tailed test.

Explanation / Answer

The p-value for t = 2.13 at n=26 ( a df of n-1=25 therefore) is .0216, which is less than alpha = .05 for a 1 tailed test

The result is significant at p < .05.

For a 2 tailed test we have P-Value is .043195.

The result is significant at p < .05.

So, Correct answer is a. Reject H0 for either a one-tailed test or a two-tailed test.

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