Determine the critical value of t in each of the following circumstances:
a. 1 - α = 0.95, n = 10
b. 1 - α = 0.99, n = 10
c. 1 - α = 0.95, n = 32
d. 1 - α = 0.95, n = 65
e. 1 - α = 0.90, n = 16