在对单个正态总体均值的假设检验中,当总体方差已知时,选用( )<br>·<img src="https://zk.995w.com/lqwvjeImg/b4/b44d03760cff92bbc6bdfa3249a66006.png"style="width:16px;height:44px;">检验法<br>·<img src="https://zk.995w.com/lqwvjeImg/6d/6d0f0b2cca332c617e1829a2e39f07c3.png"style="width:22px;height:26px;">检验法<br>·<img src="https://zk.995w.com/lqwvjeImg/fc/fcce1ebbd9e62b4bf8dbb02399b29c4b.png"style="width:29px;height:29px;">检验法<br>·<img src="https://zk.995w.com/lqwvjeImg/ea/eaf75f957e5342b922e3c8bf6163d5f0.png"style="width:37px;height:42px;">检验法