<prompt> Translate the following text to EnglishKatika hali ya pili, utafiti wa walipa kodi ungelazimika kuwa mkubwa sana kupata kiwango kizuri cha hit cha watu ambao walitafuta msaada, na utofauti wa maswali ya mtu binafsi ingekuwa na uwezo wa kuficha tofauti katika majibu ya IRS.  <response>: In the second, a survey of taxpayers would have to be very large to get a good hit rate of individuals who sought assistance, and the diversity of individual questions would have blurred ability to interpret variation in IRS responsiveness. 