【简答题】设 为来自总体 的样本 , 为样本均值,记 ,
【判断题】《中国统计年鉴》、普查(抽样调查)的数据都属于二手数据。
【单选题】There was an exciting moment in our class when a large bird flew ____ the room.
【简答题】My
son has run into the habit of misinforming. ____
【判断题】业务核算的目的,在于迅速取得资料,在经济活动中及时采取措施进行调整。
【简答题】( )的目的在于迅速取得资料,在经济活动中及时采取措施进行调整。
【简答题】One evening my sister was sleeping in her bedroom upstairs while her eight-year-old son, Jason, was in his room on the first floor. Suddenly she was wakened by a loud crash. A van has run off the road...