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Family Size and Birth order as Factors on the IQ Performance of Black and White Children

Lara Carr Steelman ; John T. Doby Sociology of Education, Vol. 56, No. 2. (Apr., 1983), pp. 101-109. Family Size and Birth order as Factors on the IQ Performance of Black and White Children. Purpose of the Experiment . Evaluate the health and well-being of American children. Hypothesis.

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Family Size and Birth order as Factors on the IQ Performance of Black and White Children

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  1. Lara Carr Steelman; John T. Doby Sociology of Education, Vol. 56, No. 2. (Apr., 1983), pp. 101-109. Family Size and Birth order as Factors on the IQ Performance of Black and White Children

  2. Purpose of the Experiment • Evaluate the health and well-being of American children

  3. Hypothesis • There is a negative relationship between family size and ability • There is a negative relationship between birth-order and ability

  4. Data • Obtained from Cycle II of the ‘National Health Examination Survey • Multi-stage, stratified probability sample • Household units/ over selected • 96% made it to final survey

  5. Subjects • Non-institutionalized children ages 6-11 in the United States

  6. Independent Variable • Family size (# of siblings) • Birth order • Race • Maternal/Paternal education • Family income • Maternal age

  7. Dependent Variable • IQ performance • IQ subtests • Vocabulary and Block design subtests of the full-scale Wechsler IQ examination for children • Adjusted for sex differences

  8. Theoretical Construct/ Operational Definition • Theoretical Construct • IQ • Operational Definition • Wechsler IQ examination for children

  9. Results

  10. Vocabulary Subtest

  11. Block Design Subtest

  12. Zero-Order Correlation Matrix

  13. Regression results yielded when predicting the IQ performance of white children

  14. Regression results obtained in the prediction of the IQ performance of black children

  15. Discussion

  16. Significant effects were found only on the vocabulary performance of white children and of black children • Results supports the view that family size affects overall tested ability through its impact on verbal ability

  17. I Would Change • Less variables • Parent/Child contact • Parental IQ

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