At Home or at Preschool? Four setsof identical twins (pairs A, B, C, and D) wereselected
Chapter 10, Problem 90(choose chapter or problem)
At Home or at Preschool? Four setsof identical twins (pairs A, B, C, and D) wereselected at random from a computer database of identicaltwins. One child was selected at random from eachpair to form an experimental group. These four childrenwere sent to preschool. The other four childrenwere kept at home as a control group. At the end ofthe year, the following IQ scores were obtained:Pair Experimental Group Control GroupA 110 111B 125 120C 139 128D 142 135Does this evidence justify the conclusion that lack ofpreschool experience has a depressing effect on IQscores? Use the p-value approach.
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