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.
1 Loveland Pass is the highest road in the nation that is kept open year-round. 2  Hikes ranging from peak-bagging to family strolls have their trailheads at the top of the pass. 3  Backcountry skiers enjoy the easy access of the pass, meaning less hiking and more skiing.he Loveland Pass before the Eisenhower Tunnel was a traffic-choked chore, but now the pass offers access to some of Colorado's best backcountry wilderness featuring mountain vistas for the hikers and skiers who find them.