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.
1 Mature Turkey Vultures have dark plumage and featherless red heads; the undersides of the flight feathers are paler. 2  An immature Turkey Vultureâs head is dark gray. 3  When trying to identify a Black Vulture from a Turkey Vulture while on the wing (in flight), one may do so by looking at the underside of the birdâs wings. They rid the landscape of deteriorating carcasses and help curb the spread of dangerous diseases and bacteria. 2  Their stomachs have strong enzymes that kill off dangerous toxins and microorganisms. 3  Vultures lack the powerful feet that are characteristic of other raptors like eagles and hawks.