A researcher conducts a repeated-measures study to evaluate a treatment with a sample of n=16 participants and obtain a t statistics of t = 2.141. The treatment is expected to increase scores and the sample mean shows an increased . Which of the following is the correct decision for a hypothesis test using alpha = .05? a. Fail to reject the null hypothesis with either a one-tailed or two-tailed test b. Fail to reject the null hypothesis with a one-tailed test but reject with two tails c. Reject the null hypothesis with a one-tailed test but fail to reject with two tails d. Reject the null hypothesis with either a on-tailed or a two-tailed test