I did a study. I took my CV and changed the name to a female name. I'd send it out with my real name, then a few days later (or a few days before) with a female name.

Out of 100, my applications with a female name got 7 responses for an interview.

Out of 100, my applications with a male name got 45 responses to interview

The male resume was 650% more likely to get a callback. And the resumes were identical.

I thought "what about someone looking for working-class jobs?" So I decided to focus on construction. Made a fake resume and responded to craigslist ads with both male and female names. Sometimes the male went first, sometimes the female went first.

Out of 100, my applications with a female name got 10 responses to interview

Out of 100, my applications with a male name got 87 responses to interview

The male resume got 870% more responses.