Question 5 Peggy’s parents are amazed at how much their daughter has changed. Over the past year, she became interested in doing chemistry experiments. Peggy predicts what will happen when she combines two chemicals together and then observes the results to see whether her hypothesis was correct. Peggy is most likely in the ________ stage of cognitive development. formal operational preoperational concrete operational sensorimotor

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formal operational

She’s forming hypotheses and testing them — hypothetico-deductive (scientific) reasoning characteristic of Piaget’s formal operational stage.