Identical twins reared apart. Because they share an identical genotype, twins make ideal subjects for investigating the degree to which various environmental conditions affect personality. The classical method of studying this phenomenon, nomenon, and the subject of an interesting book by Susan Farber ( Identical Twins Reared Apart, New York: Basic Books, 1981), is the study of identical twins separated early in life and reared apart. Much of Farber’s discussion focuses on a comparison of IQ scores. The data for this analysis appear in the accompanying table and are saved in the TWINSIQ file. One member (A) of each of the n = 32 pairs of twins was reared by a natural parent; the other member (B) was reared by a relative or some other person. Is there a significant difference between the average IQ scores of identical twins when one member of the pair is reared by the natural parents and the other member of the pair is not? Use α = .05 to draw your conclusion.
Pair ID | Twin A | Twin B | Pair ID | Twin A | Twin B |
112 114 126 132 136 148 170 172 174 180 184 186 202 216 218 220 | 113 94 99 77 81 91 111 104 85 66 111 51 109 122 97 82 | 109 100 86 80 95 106 117 107 85 84 125 66 108 121 98 94 | 228 232 236 306 308 312 314 324 328 330 338 342 344 350 352 416 | 100 100 93 99 109 95 75 104 73 88 92 108 88 90 79 97 | 88 104 84 95 98 100 86 103 78 99 111 110 83 82 76 98 |
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