Design surveys, publish them and ask people to fill them in. Then follow the results. You can combine polls or answers for calculating common stats and you can even pick them from different surveys. (e.g., when you want to combine data collected from surveys in different languages)
demo:
https://survey-cms.herokuapp.com/admin/
take a look (fixtures):
user: example
pass: test321
... or sign up and compose your own surveys
(hint: navigate to "Surveys")