<prompt> Translate the following text to EnglishTulianzisha seti ya maswali ya kawaida ya kodi ya mapato ambayo wananchi kwa kawaida wangepiga simu IRS, kupata makubaliano ya IRS juu ya majibu sahihi ya maswali haya, na kisha, kwa msingi wa sampuli ya uwezekano, tukaita ofisi za IRS kote nchini kutafuta msaada.  <response>: We developed a set of standard income tax questions about which citizens typically would call IRS, obtained IRS agreement on the correct answers to these questions, and then, on a probabilistic sampling basis, called IRS offices around the country to seek help. 