text: Hence it is possible to find numbers â ' z and z , independent of Î 1\/4 , between which Z lies with probability 1 â ' Î , a measure of how confident we want to be .
simplified: Hence it is possible to find numbers â ' z and z , independent of Î 1\/4 , where Z lies in between with probability 1 â ' Î , a measure of how confident we want to be .