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.
In February to April, females lay 1-3 eggs with an incubation period of 28 to 40 days. Black Vultures are thought to mate for life, whereas Turkey Vultures form established pairs only to raise young during the breeding season.Vultures are migratory, social birds that form large communal roosts.wo species of vulture can be observed in Fairfax County: Black vultures (Coragyps atratus) and Turkey vultures (Cathartes aura). Black vultures are 22 to 27 inches long with a 4.5 to 5 foot wingspan, and weigh 4 to 5 lbs.