Assume a onetailed situation at alpha 005 with one sample o

Assume a one-tailed situation at alpha = 0.05 with one sample of 12 cases and one of 20 cases. Use the difference between the means test. What is the critical value of t?

answer options-------> 2.042, 2.457, 2.750, 1.697

Solution

This time, the number of degrees of freedom is

df = n1 + n2 - 2 = 12 + 20 - 2 = 30

Thus, at one tailed 0.05 level, the critical value is

tcrit = 1.697 [ANSWER, D]