One-tailed test

A one-tailed test is a statistical method used to determine if a certain outcome is likely to occur in one specific direction. For example, if researchers want to test if a new drug is better than an existing one, they might only check if it's significantly more effective, not if it's worse. This approach focuses on finding evidence for improvement in one way, rather than considering changes in both directions. It's useful when researchers have a clear hypothesis about the direction of the effect they expect to see.