Physical strength increases during middle adulthood.

In a study by Bandura and Perloff (1967) children either gave themselves tokens for turning a wheel of were given tokens by the experimenter. The result was significantly better performance by those reinforced themselves.

a. true b. false

Dr. Kim decided to conduct interviews with middle school children rather than administering questionnaires because she wanted to hear from them in their own words. Her use of interviews is an example of ______________

a. an unbiased sample b. confidential responses c. a theory d. the research method