Working-class Jews II: I wanted to explore this issue a little further since income is one thing, but it does not tell us what kind of work people are doing. So I found a question on the same survey asking if you have to lift heavy things at work. Here are the results (in percentages):
No religion 47.0
I suppose you can read these numbers either way: the stereotype is generally true, but 1 out of 7 Jews has to schlep heavy stuff on the job.