The perennial concern about low quality questions and low quality answers is resurfacing again. It is my impression (not backed by data) that many VLQ answers are posted by rep 1 unregistered people. This seems to be true also of some low quality questions.

Is there data or could data be obtained to back up or refute this impression?

Could ELU run an experiment (for say, 3 months) requiring new users to register before posting?

This seems like an effort which might: (a) reduce the VLQ posts; (b) be unlikely to scare off people we want to attract; and (c) not require a lot of work to implement and analyze. 

**Addendum in response to comments so far**: Is it likely that ELU will be **permitted** by SE to require registration, either as a test or permanently? If not, we should move on.
['https://english.meta.stackexchange.com/questions/8191', 'https://english.meta.stackexchange.com', 'https://english.meta.stackexchange.com/users/121061/']
A strain on the community? How hard is a downvote on a poorly written question?
My account is two years old, but I started off few months ago.  

I'm not a native English speaker, and I have made mistakes a lot.  

If such a quiz was mandatory, I wouldn't even have joined at all.