Answer
The critical values are -2.05 and 2.05. The rejection region is any value below -2.05 and above 2.05
Work Step by Step
Using TI-84 calculator:
1. 2nd
2. VARS
3. Scroll down to invT
4. Input the alpha given in the problem/2 for the area. In this case area = 0.025
5. Input n -1 for degree of freedom. In this case, df = 26.
6. The output is the critical value and the rejection region.