Question: Let 1 and 2 represent the mean Full Scale IQ score for all first-born identical twins and second-born identical twins, respectively, and let d be

Let 1 and 2 represent the mean Full Scale IQ score for all first-born identical twins and second-born identical twins, respectively, and let d be the mean of the differences in IQ score of all identical twins (IQ score of first-born twin - IQ score of second-born twin). Which are the appropriate null and alternative hypotheses? H0: d = 0Ha: d > 0 H0: d = 0Ha: d < 0 H0: d > 0Ha: d = 0 H0: 1 = 2Ha: 1 > 2

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