【单选题】一药厂为了解其生产的某药物(同一批次)的有效成分含量是否符合国家规定的标准,随机抽取了该药10片,得其样本均数与标准差;估计该批药剂有效成分平均含量的95%可信区间时,计算公式中应用到下列哪个界值:
【简答题】一药厂为了了解其生产的某药物(同一批次)之有效成份含量是否符合国家规定的标准,随机抽取了该药 100 片,得其样本均数为 103.0mg ,标准差为 2.22mg 。试估计该批药剂有效成份的平均含量。
【简答题】Technician A says that in the hybrid technology series system one power source is the gasoline engine and the other power source is the motor/generator. Technician B says that the system described is ...
【简答题】Technician A says that in a waste spark system two plugs fire simultaneously on two different cylinders, one of which is on the compression stroke and the other is on the exhaust stroke. Technician B ...
【单选题】一药厂为了解其生产的某药物(同一批次)的有效成分含量是否符合国家规定的标准,随机抽取了该药10片,得其样本均数与标准差;估计该批药剂有效成分平均含量的95%可信区间时,在T界值表中应查自由度为( )的T界值:
【单选题】By midnight the floor was wet with beer. One young technician slipped and bumped into another. They struggled, ________ trying to get the other in a head-lock.
【单选题】One technician said to me, “You know the old saying: A bad dress rehearsal makes for a great opening!” I tried to smile back.
A.
一位技师对我说:“你知道那句老话‘糟糕的彩排会带来成功的开场’吗?”我努力地回以微笑。
B.
一位技师对我说:“你知道那句老话‘糟糕的表演会走向成功的开场’吗?”我努力地回以微笑。
C.
一位技师对我说:“你知道那句老话‘糟糕的服装设计有助于成功的开场’吗?”我努力地回以微笑。
【单选题】一药厂为了解其生产的某药物(同一批次)的有效成分含量是否符合国家规定的标准,随机抽取了该药10片,测每片中的平均含量;得其样本均数与标准差;估计该批药剂有效成分平均含量的95%可信区间时,应用( )。
A.
样本均数加或减t(0.05/2,9)*样本标准误