TY - JOUR T1 - Article 5. An introduction to estimation--2: from z to t JO - Emergency Medicine Journal PY - 2001/12/01 AU - Driscoll P ED - DO - DOI: 10.1136/emj.18.1.65 PB - BMJ VL - 18 IS - 1 SP - 65 EP - 70 Y2 - 2024/12/22 ER -