Much of Leta Hollingworth's research on the psychology of sex differences cast doubt on the validity of

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Leta Hollingworth's research primarily challenged the variability hypothesis, which suggested that men have a wider range of intellectual and physical abilities than women, leading to more men at both the highest and lowest ends of the spectrum. Her work provided evidence against this theory, showing that when given equal opportunities, women performed equally well as men in various fields, thereby casting doubt on the validity of the variability hypothesis.

Much of Leta Hollingworth's Research on the Psychology of Sex