设X1,X2,…,Xn是来自总体X的样本,X的分布密度为:
试用矩估计法估计总体参数θ.
参考答案:
因为
所以
解析:[考点提示] 参数估计.
根据施工安全检查的内容,安全检查的主要内容包括查思想和( )。
A.查制度
B.查隐患
C.查整改
D.查责任
E.查伤亡事故处理
第一节从方框中选出最佳选项完成下面的对话。
A: Hi, Bill. You were not at school yesterday. 小题1:
B: Oh, I fell off my bike on my way to school and hurt my leg.
A: I’m sorry to hear that. 小题2:
B: No, my father took me to the hospital. 小题3:
A: We should be more careful when we ride. In fact, we should never ride too fast.
B: You are right. 小题4: If we break the rules, we may be in danger.
A: Let’s go to the traffic station to learn more rules.
B: 小题5: