They published this https://www.ipsos.com/sites/default/files/2017-03/IpsosPA_CredibilityIntervals.pdf https://www.ipsos.com/sites/default/files/2017-03/IpsosPA

They published this https://www.ipsos.com/sites/default/files/2017-03/IpsosPA_CredibilityIntervals.pdf https://www.ipsos.com/sites/default/files/2017-03/IpsosPA_Cr... I haven't read it, but it appears to answer some of your concerns.