Type of idea or question; makes statement about something that may be true. Tentative idea or question waiting for evidence to support or refute it. Once proposed, data must be gathered and evaluated in terms of whether evidence is consistent or inconsistent w/ hypoth. Geller, russ, and altomari (1986) : do males and females differ in amount they drink? or do mixed-sex groups, male-only groups, and female-only groups differ in time they stay in bar? . 1st question phrased as a hypothesis there is gender difference in amount of alcohol consumed. putting forth an idea that two variables, gender and alcohol consumption, maybe. Design experiment to test, which simulate the conditions in the hypothesis. Researcher would make specific prediction concerning outcome of experiment. related. Prediction confirmed by results of study, hypothesis supported. Will either reject hypothesis or conduct further research using different. Important to note when results of study confirm a prediction, hypothesis only supported, not proven.