Since first-borns exceed later-borns in academic achievement and IQ does not differ systematically, one may test the hypothesis that first-borns have higher need achievement than later-borns. Various measures of need achievement were used with three separate samples of adults. The hypothesis was not supported.
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References
1.
SampsonE. E.Birth order, need achievement and conformity. J. abnorm. soc. Psychol., 1962, 64, 155–159.
