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.
New World Vultures are found in North and South America, Old World Vultures in Europe, Africa and Asia, meaning that between the two groups, Vultures are found on every continent except Australia and Antarctica.A particular characteristic of many vultures is a bald head, devoid of normal feathers.This helps to keep the head clean when feeding. Research has shown that the bare skin may play an important role in thermoregulation. A group of vultures is called a wake, committee, venue, kettle, or volt. particular characteristic of many vultures is a bald head, devoid of normal feathers. This helps to keep the head clean when feeding. Research has shown that the bare skin may play an important role in thermoregulation. A group of vultures is called a wake, committee, venue, kettle, or volt.