Furthermore, if there are 400,000 tech workers in Silicon Valley, then 200 gives us a less than 8% margin of error (95% confidence level). This still gives us a result of at least 50%.
But we're not surveying the entire tech industry, we're surveying women in Silicon Valley, which is a number much closer to 100,000 (although that doesn't radically change our margin of error).
- women who were assaulted, harassed, or threatened have already left SV
- women who were assaulted, harassed, or threatened were more likely to respond
- women who don't believe in an anti-female culture in SV were more likely to respond
- etc.
It's up to the designers of the survey to control for these things within the survey and/or disclose them. Unfortunately, they haven't.
I'd like to see the peer review on this one, to tell you the truth.