If n = 25 and α = .05 in a right-tailed test of a mean with unknown σ, the critical value is: A)1.960 B)1.645 C)1.711 D).0179 Using d.f. = 24, t_.05 = 1.711 from AppendixD.

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Since it is a right-tailed test, we need to find the critical value with a significance level of .05 and degrees of freedom of 24 (n-1). Using Appendix D, we find that the critical value for this scenario is 1.711. Therefore, the correct choice is C.

If N = 25 and α =