Answer
The critical value is 2.457. The rejection region is any value above 2.457.
Work Step by Step
Using TI-84 calculator:
1. 2nd
2. VARS
3. Scroll down to invT
4. Input 1- alpha given in the problem for the area. In this case area = 0.99
5. Input n -1 for degree of freedom. In this case, df = 30.
6. The output is the critical value and the rejection region.