Determine the t critical value for a lower or an upper confidence bound for each of the

Question:

Determine the t critical value for a lower or an upper confidence bound for each of the situations described in Exercise 30.
a. Confidence level = 95%, df = 10
b. Confidence level = 95%, df = 15
c. Confidence level = 99%, df = 15
d. Confidence level = 99%, n = 5
e. Confidence level = 98%, df = 24
f. Confidence level = 99%, n = 38