Whatever gender differences exist in abilities are statistical and small and say nothing about any individual.

Judge as of 2013-03-12 against meta-analyses of sex differences in cognitive abilities. True: meta-analyses show that differences in abilities between men and women are statistical averages with small effect sizes (roughly d < 0.35), so a person's sex predicts little about their individual ability. Mostly true: most differences are small, with a few moderate ones (e.g., mental rotation, d ≈ 0.5–0.9) or differences in variance that the claim glosses over, while the point about individuals stands. Mixed: a substantial share of the ability differences studied are moderate or large. Mostly false: many important ability differences are moderate to large, so 'small' and 'tell us nothing' clearly overstate the case. False: the evidence shows large average differences in abilities that substantially predict an individual's ability from their sex.

Set before the research began.

1. E1 The Gender Similarities Hypothesis. American Psychologist (APA), indexed by ERIC · September 2005

   “Results from a review of 46 meta-analyses support the gender similarities hypothesis.”

2. E2 The Gender Similarities Hypothesis. American Psychologist (APA), indexed by ERIC · September 2005

   “Gender differences can vary substantially in magnitude at different ages and depend on the context in which measurement occurs.”

3. E3 Sex Differences in Variability in Intellectual Abilities: A New Look at an Old Controversy Review of Educational Research (Sage) · March 1992

   “Males were consistently more variable than females in quantitative reasoning, spatial visualization, spelling, and general knowledge.”

4. E4 Sex Differences in Variability in Intellectual Abilities: A New Look at an Old Controversy Review of Educational Research (Sage) · March 1992

   “Because these sex differences in variability were coupled with corresponding sex differences in means, it was demonstrated that sex differences in variability and sex differences in central tendency have to be considered together to form correct conclusions about the magnitude of cognitive gender differences.”

A 2005 review of 46 meta-analyses supports the gender similarities hypothesis (E1). That broadly fits the claim that ability differences between men and women are small averages. The same review notes that the size of the differences can vary a lot with age and context (E2). A 1992 review found males consistently more variable than females in several abilities, and argued that differences in variability and differences in averages must be considered together (E3, E4). The claim leaves this out, so it resolves mostly true rather than fully true, though the quoted evidence gives no exact effect sizes.