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This week andrea is babysitting her younger sisters, cassy, who is the youngest, and nikki. andrea fixes them both a glass of their favorite juice except that cassy's glass is taller and nikki's is wider and shorter. andrea anticipated that nikki would complain, but she did not. when andrea asked nikki why, nikki replied that the glasses held the same amount. nikki is in which stage of cognitive development according to piaget's theory

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Piaget differentiates four stages in the cognitive development:  the sensorimotor, preoperational, concrete operational and formal operational period.
Niki is in the concrete operational stage  of cognitive development according to Piaget's theory.
 The concrete operation stage takes place through the ages 7 to 12, in which the logical thought about concrete and specific things is developed.

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