I was pleasantly surprised to discover that they give you a ton of information about the survey and analysis (here: https://context-cdn.washingtonpost.com/notes/prod/default/do...)
Along with crosstabs for each question here: https://docs.google.com/spreadsheets/d/1u7j63YU7FSYsUXxvSMpH...
In the half sample, they asked about eight different kinds of businesses (Question 4a-4h) and with the exception of movie theatres (18%) and golf courses (41%), they were all in the 20s to 30s.
As for reopening with conditions, I don't know that there are concrete plans that would be easy to poll. I think you'd lose a lot of people if you had to describe a series of possible schemes in great detail.
The overall adult sample is weighted using a raking procedure to match the demographic makeup of the population by sex, region, age, education, race/ethnicity, marital status, and population density according to Census Bureau estimates.
What I vaguely recall from stats is that even a small sample size that is really far off from the larger sample is statistically nearly impossible. This means something is amiss, so I defer to my lyin' eyes. I know my eyes, don't know the authors.
— Jeff Bezos
Trusting your eyes over people with replication rates in the 20-50% range (ie, social scientists) is probably a rational choice.
There’s plenty of evidence that polls have systemic inaccuracies — question phrasing, people giving “right” answers, etc.