The following is a description of a child being assessed in Piaget's pendulum task: "They may try the heaviest weight on the longest string dropped from medium height with medium force, then a medium weight on the smallest string dropped from
medium height with lesser force. If they happen to arrive at the right answer they find it difficult to explain why." According to this description, it is clear that the child is in which of Piaget's stages of cognitive development?
a. sensorimotor
b. preoperational
c. concrete operations
d. formal operations
C. Children who engage in trial and error to solve the pendulum task are more likely in concrete operations. The child is not in formal operations because he or she cannot explain the rationale behind the solution.
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Based on the MOST current research, we can conclude that:
A) MMR vaccinations are probably related to the incidence of autism. B) MMR vaccinations are related to some, but not all of the cases of autism. C) as parents have refused MMR vaccinations for their children, the incidence of autism has declined. D) MMR vaccinations are not related to the development of autism.
A _______________ is an experiment in which neither the participants nor the individuals running the experiment know if a given participant is in the experimental or the control group until after the results are tallied
a. double-blind study b. single-blind study c. meta-analysis d. correlational study