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.
ACS Distance Education explains that air pressure is the force exerted by the weight of air molecules. Atmospheric pressure is determined by the amount of air directly above a person or object. At sea level, the atmospheric pressure is 14.7 pounds per square inch, or PSI. At higher altitudes, the PSI decreases due to lower air pressure and density.