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5) A researcher is interested in the effect of preschool education on academic performance later in life. He randomly selects 40 children whose parents could

5) A researcher is interested in the effect of preschool education on academic performance later in life. He randomly selects 40 children whose parents could not normally afford preschool, and randomly assigns them to one of two groups. The children in group 1 receive free preschool, and the children in group 2 serve as a control group and do not attend any preschool

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