Dr. Winstell is interested in studying prejudice and devises a study in which Caucasian participants are led to believe that they are chatting electronically with an African American participant. In reality, the participants are responding to another Caucasian participant, and she discloses this information to all participants at the end of the study. Dr. Winstell has used in her study.

Deception

Explanation:

Dr winstell used deception in her study about prejudice by not disclosing true information. She is a Caucasian who disguises as an African American to get information from Caucasian participants. Deception in research has to do with withholding or failing to disclose true information on purpose to human participants about the method of the research. It is used sometimes in social behavioral and educational research. Misleading the participants can help Dr Winstell get unbiased information.

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.