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Appendix —Table B
Pages 2

For the Two-Sample t Test: df = n1 + n2 2 where n1 represents the number of elements in sample set one and n2 represents the number of elements in sample set two.

Once the degrees of freedom have been determined and the level of significance has been selected, simply locate the critical value from the table on page 610. If the calculated value of t is equal to or greater than the critical value obtained from the t table, reject the null hypothesis and support the alternative hypothesis. If the calculated value of t is less than the critical value, retain the null hypothesis and reject the alternative hypothesis.