A researcher obtains t = 2.25 for a repeated-measures study using a sample of n = 10 participants. Based on this t value, what is the correct decision for a two-tailed test?
a. Reject the null hypothesis with = .05 but not with = .01
b. Reject the null hypothesis with both = .05 and = .01
c. Fail to reject the null hypothesis with both = .05 and = .01
d. Cannot make a decision without additional information
Question 2
A researcher conducts a 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
The threespine stickleback (Gasterosteus aculeatus) has been used as a model organism for the study
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