If the question is "Does open [statistical] data exist for [some topic]?"...
It sounds like those questions would be excellent candidates for Open Data, where the focus of the community is on working with open data sets. So while we are "Open Source", which might include "Open Data", we should keep "finding open data sets" out of our scope.
If the question is "Is there data to support [something relevant to Open Source]?", such as "Is there data supporting the idea that [insert minority group] is represented more in Open Source than in the industry?"...
I think these questions would be on topic, as these are directly related to Open Source. While my example might not be the greatest, questions where external statistical data is required are common and are definitely relevant to this community.