下面四幅等高线图所示各项内容正确的是
A、A
B、B
C、C
D、D
答案:D
统计推断包括()
A.统计描述和假设检验
B.参数估计和假设检验
C.统计描述和统计分析
D.点估计和区间估计
E.计算出均数和标准差
Taking care of children calls for your time, abilities, patience and emotions. _____, it is not a simple thing.
A.On the contrary
B.What's more
C.In conclusion
D.On the other hand