As part of a study in auditory perception, a group of students was made to listen to a low-volume music track. When they first put on their headphones, they almost couldn’t hear anything. But as they became more attentive, the sound gradually became clearer. This is an example of .

a. retinal disparity
b. pitch increase
c. sensitization
d. subliminal stimulation

French revolution to the correct category

What are some similarities between islam and judaism?

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.