What critical t value would be needed to construct a 90% confidence interval on a sample of size 22?

Question

1.717

1.323

2.080

1.321

1.721

Answer 1

Looking it up in the back of a statistics text in a table for "distribution of t probability," you need to realize that 1 - .9 = .1.

Try .1 with n-1 or 21 df.

Answer 2

2.080