Find the critical value of Student’s t for each hypothesis test. a. 10 percent level of significance, two-tailed test, n = 21 b. 1 percent level of significance, right-tailed test, n = 9 c. 5 percent...

Find the critical value of Student’s t for each hypothesis test.

a. 10 percent level of significance, two-tailed test, n = 21

b. 1 percent level of significance, right-tailed test, n = 9

c. 5 percent level of significance, left-tailed test, n = 28