<p>In general, if two subjects are close together in terms of the number, the difference is merely due to the population. If there are more White engineers in a certain field, the average is usually higher. But if, say there are 5 Asian and 10 White in PE, and the Asian makes $76k and the white mkaes $80K, then we may conclude that the Asian makes more money than the White, based the population.</p>
<p>Women don’t make bad engineers, but I think most employers prefer male engineers, espeically in PE, CE, ME, EE.</p>
<p>Moreover, the survey doesn’t reveal or try to distinguish the respondents by their experiences, their age, etc. But nonetheless the resulting number is realistic and true.</p>