C Appendix
t-Table
Probabilities
Note: The probabilities given in the table are for two-tailed tests. Thus, a probability of 0.05 allows for 0.025 in each tail. For example, for the probability of 0.05 and 21 df, t = 2.080. This means that 2.5 percent of the area under the t distribution lies to the right of t = 2.080, and 2.5 percent to the left of t = –2.080.
Source: From table III of Fisher and Yatres, Statistical Tables for Biological, Agricultural and Medical Research, 6th ed., 1974, published by Longman Group Ltd., London (previously by Oliver & Boydm Edinburgh), by permission of the authors and publishers.
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