What is typically done to reduce the possibility of selection biases?
a) Choose the sample from a population that is believed to be very similar.
b) Control for the similarity of experimental participants.
c) Use random assignment to place participants into different experimental conditions.
d) Add a control group to the experiment.
Correct Answer: c
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Leila is six years old and in the preoperational stage of cognitive development. What process will help her move toward the concrete operational stage?
initiative imitation accommodation classical conditioning
Identical twins reared together and apart tend to score similarly on standardized measures of intelligence. Which of the following statements does this finding support?
a. Intelligence levels are based on environmental factors for both twins reared together and twins reared apart. b. Environmental factors are stronger influences on twins raised together compared to twins reared apart. c. The "intelligence gene" is identical in both twins reared together and reared apart. d. Genes are an important source of individual variations in intelligence scores.