## ← Two-Tailed t-Test - Intro to Inferential Statistics

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Showing Revision 6 created 05/25/2016 by Udacity Robot.

1. Well, remember that the degrees of freedom is n minus one, so our degrees of
2. freedom is 29, so if we bring up the t table, we look for degrees of freedom is
3. 29, and we also know that if alpha equals 0.05 for a two tailed test. Then
4. 0.025 is in each tail. So we look for where it says the tail probability is
5. 0.025. At 29 degrees of freedom, we get 2.045 as our t critical value. That
6. means that negative 2.045 is the t critical value that cuts off the lower
7. 0.025.