11. At Home or at Preschool? Four sets of identical twins (pairs A, B, C, and D) were selected at random from a computer database of identical twins. One child was selected at random from each pair and was sent to preschool, while the other four children were kept at home as a control group. At the end of the year, the following IQ scores were obtained:

Does this evidence justify the conclusion that lack of preschool experience has a depressing effect on IQ scores? Use the p-value approach.

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Pair Preschool Group Control Group ABCD 110 111 125 120 139 128 142 135