There is a close relationship between confidence intervals and significance tests. Specifically, if a statistic is significantly different from 0 at the 0.05 level, then the 95% confidence interval will not contain 0.
U.S. National Library of Medicine(0.00 / 0 votes)Rate this definition: Air Pressure. The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment.
A barometer measures the air pressure. The air pressure is a function of how much air is pressing over an area. Air pressure will change rapidly with a change in altitude. Because of this rapid change with altitude, reported pressure is usually adjusted to sea level.