In the hypothesis testing approach of Jerzy Neyman and Egon Pearson, a null hypothesis is contrasted with an alternative hypothesis, and the two hypotheses are distinguished on the basis of data, with certain error rates. Proponents of each approach criticize the other approach.
In geography, relief refers to the highest and lowest elevation points in an area. Mountains and ridges are typically the highest elevation points, while valleys and other low-lying areas are the lowest. Relief is essential to understanding the topography of an area.
1. (Geological Science) the lowest point of a ridge connecting two mountain peaks, often constituting a pass. 2. (Physical Geography) meteorol a pressure region between two anticyclones and two depressions, associated with variable weather.