Find the critical t values in the following cases:

a. n = 4, = 0.05 (two-tailed test)

b. n = 4, = 0.05 (one-tailed test)

c. n = 14, = 0.01 (two-tailed test)

d. n = 14, = 0.01 (one-tailed test)

e. n = 60, = 0.05 (two-tailed test)

f. n = 200, = 0.05 (two-tailed test)