During a test, the scientist may try to prove or disprove just the null hypothesis or test both the null and the alternative hypothesis. If a hypothesis specifies a certain direction, it is called one-tailed hypothesis.
A mountain pass (also called a gap, saddle, or col) is a passage over a mountain range. They typically occur in valleys between mountain ridges, in low points along mountain watersheds or just the lowest point on a mountain ridge between two peaks. They can be relatively short in length (the width of a ridge) or they can be valleys many miles long. Mountain passes are often the location where roads and railways are built to get through the mountains. Many of them have become famous throughout history for their importance in trade and commerce.
â¢ MOUNTAIN PASS (noun). The noun MOUNTAIN PASS has 1 sense: 1. the location in a range of mountains of a geological formation that is lower than the surrounding peaks. Familiarity information: MOUNTAIN PASS used as a noun is very rare.umberland Gap (a pass through the Cumberland Mountains between Virginia and Kentucky that early settlers used in order to move west). Donner Pass (a mountain pass in northeastern California near Lake Tahoe; site where in 1844 some members of an emigrant party survived by eating those who had died).