In a study by Inhelder and Piaget (1958) that involved a pendulum, they found that between the ages of 12 and 16, a sophisticated problem solving approach was taken in which
a. one variable at a time is manipulated.
b. all variables are tested at once.
c. a syllogism is used.
d. adolescents look up the solution online.
Answer: a. one variable at a time is manipulated.
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