Mat has a confederate drop a stack of papers, either in front of one person or in front of a group of people. She then measures the amount of time it takes for the confederate to receive help in picking up the papers. The manipulation employed in this experiment would be an example of a manipulation.

Asociologist wants to study a culture that occurs in some women’s prisons: “state families,” in which individual prisoners take on certain roles within a group of like-minded prisoners. there is previous evidence that younger prisoners will use older inmates who play the roles of grandparents as a resource before they will turn to staff for and advice. the lieutenant in charge of a dorm of long-term prisoners offers to gather volunteers to speak to the researcher and also offers to vouch for the integrity of the researcher. the use of this staff is: a valid use of a statistical technique referred to “snowball sampling” wherein the inclusion of the first subject leads to the recruitment of another one subject. a useful tactic in obtaining a sample of prisoners who both meet the criteria and who will be honest with the researcher. wrong and is prohibited; subject selection needs to be free from intervention by prison authorities or prisoners. acceptable only when the researcher’s irb grants a special waiver.

What greek scientist created a screw to move water for irrigation?

You're doing research for a public essay on alternative medicine. which of the following sources has the most reliable information? a. a post on a social networking site about the undesired side-effects of different alternative medicinesb. a recent government report comparing the results of alternative and contemporary medicine for a specified diseasec. an anonymous article on a medical website that claims the success of alternative medicined. a 2003 study conducted by a medical research center about the effects of alternative medicine