A researcher conducts the repeated-measures study to evaluate a treatment with a sample of n = 16 participants and obtains a t statistic of t = 1.94. The treatment is expected to increase scores and the sample mean shows an increase. Which of the following is the correct decision for a hypothesis test using ? = .05.
a. Reject the null hypothesis with a one-tailed test but fail to reject with two tails.
b. Reject the null hypothesis with either a one-tailed or a two-tailed test.
c. Fail to reject the null hypothesis with either a one-tailed or a two-tailed test.
d. Fail to reject the null hypothesis with a one-tailed test but reject with two tails.