ANALYZING LISTENING TESTS WITH THE DIRECTIONAL 2-TAILED TEST

Researchers typically analyze double-blind listening tests with a one- tailed significance test, which provides for deciding whether performa nce is better than chance. But the little-known directional two-tailed test, which provides for deciding whether performance is better or wo rse than chance, may be more useful to some investigators. This paper compares the tests, discusses when to use them, and provides statistic al tables for conducting the tests without calculation.