單側同雙側檢定

單側同雙側檢定（one- and two-tailed tests）係假說檢定上嘅一個概念：單側檢定（one-tailed test）指個假說講明咗 ${\displaystyle \mu _{2}}$ 處於 ${\displaystyle \mu _{1}}$ 邊一面，即係 ${\displaystyle \mu _{1}>\mu _{2}}$ 或者 ${\displaystyle \mu _{1}<\mu _{2}}$，而雙側檢定（two-tailed tests）指個假說冇講明 ${\displaystyle \mu _{2}}$ 處於 ${\displaystyle \mu _{1}}$ 邊一面，即係單純嘅 ${\displaystyle \mu _{1}\neq \mu _{2}}$。