It's great to see more good work on gender issues in the discipline of philosophy.
It has been hit-or-miss finding a gender-effect on knowledge attributions. I have done my fair share of studies on knowledge attributions over the past year. Most of these have used dichotomous measures: over thirty experiments, with an average of over three conditions per experiment (differing by cover story), and over 5,000 participants in total. For a very small number of these, I didn't collect demographic information. The studies focused on cases relevant to a wide range of questions about knowledge, including Gettier cases, Fake Barn cases, factivity, perception, inference, lotteries, closure, moral valence, and others.
It has long been my impression of the data that women are more likely to attribute knowledge than men, even though the difference in any one study never reaches statistical significance. If there is a modest but real difference, my individual studies weren't powerful enough to detect it.
So I aggregated data for all knowledge attributions that I gathered gender demographics for. The result confirms the impression: there is a small but real gender difference, with women ascribing knowledge more often than men.
N = 4967 (M/F: 3014/1953)
Percent attributing knowledge (M/F): 62.8%, 67%
Fisher's exact test, p = .003, two-tailed, Cramer's V = .043.