Experiment 29

Matched Pairs design
Matched Pairs t-test
Wilcoxon matched-pairs signed-ranks test

Twenty pairs of monozygotic twins are recruited as part of a study of genetic influences on reading ability. The hospital consultant involved has a theory that the first born of a pair of twins will tend to out-perform the second born on a variety of measures. Accordingly, the IQ at age 8 years is compared for the first and second born in each pair of twins.

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