总体分布正态，总体方差[tex=1.0x1.286]Rx0l9lkKLR0hsh9BQCKuow==[/tex]知时，从总体中随机抽取容量为25的小样本，用样本平均数估计总体平均数的置信区间为 未知类型：{'options': ['[tex=13.5x2.429]DzIVuM/MGk4xQmlFQiODO0d4kwcRaAYJaDodsdcIbUVo8YFuB5n8BXzUWveK4Q9vXcDcZ8CiaeUVfGcuj5jkT+812iG22CCiZTzSmKIMLBc=[/tex]', '[tex=12.857x2.429]rIg8UNE5kyRqbvnR9dJdGRFDYfY64Z/y/PcdnwXfg70AMYD0xcpOkcmDaQCZr0SrVqllLfXnhymSWRVKqngimRc9iVAEuQaqZv9CkkZkqXA=[/tex]', '[tex=16.071x2.429]DzIVuM/MGk4xQmlFQiODOz0cvDQdwWo5dXcoU8p57aWlka/cHDJS0oj8E11Lzu6ZJ4Y7AbuJIrTuWErlqIQysqOp09WD8tWRLLySgXHKcTjhSQp8SP1AikT6db+PjQ6h[/tex]', '[tex=15.429x2.429]rIg8UNE5kyRqbvnR9dJdGS0zPoSmHwJ0ShWfeshmO8kU8mlwt7jytSzsYbjIbv9gInwZFoHw4bCecUs9/QUmgUb8TIFRr1shXJ+K9HInx2JdlfdAJkBGVuu2kRH9qwqW[/tex]'], 'type': 102}