2. An educator wants to determine whether early exposure school will affect IQ. He enlists the aid of the parents of 12 pairs of pre-school-age identical twins who agree to let their twins participate in the experiment. One member of each twin pair is enrolled in preschool for 2 years while the other member of each pair remains at home. At the end of 2 years, the IQs of all the children are measured. The results follow: (Pagano, 2010) If proved significant, compute of the effect size.

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