Say is the average increase in shoe size for upper-class people compared to middle-class people: then the Wald test can be used to test whether is 0 (in which case social class has no association with shoe size) or non-zero (shoe size varies between social classes).
There are many different species of vultures and each has a different type of habitat. Turkey vultures are the most prominent of the New World vultures and can be found in Southern Canada, the Continental United States, Mexico, Central America and South America. These vultures live in small caves, beneath bushes, in hollowed out logs, and sometimes in abandoned structures.
Range: The black vulture is one of the most abundant vulture species in North America. It is found throughout central Texas, southeastern Oklahoma, Arkansas, western Tennessee and Kentucky, southwestern Ohio, Virginia, Maryland, southeastern Pennsylvania, southern New Jersey as well as the southeastern states.abitat: Vultures often roost and feed in large groups. A group of vultures is called a venue. Circling on hot air currents, they are referred to as a kettle, because they appear as bubbles overflowing a pot of boiling water.