1. a chart showing all possible outcomes of a situation under specified conditions and their likelihoods of occurrence. For example, one could create a probability table for the number of boys born into a family. 2. a display of critical values for various statistical tests (e.g., z test, t test, F test, chi-square test) at different significance levels and with different degrees of freedom. Probability tables traditionally were presented as appendixes in the back of statistics textbooks but currently are widely available via computer software.