【单选题】The writer concludes that tourism in the Third World ______.
A.
produces only limited economic benefits
B.
amounts to a present-day form. of colonialism
C.
is developed at the expense of other industries
D.
will bring prosperity to it only in the distant future
【单选题】Tourism, _____ it brings in money to a country, can also result in damage to the World Heritage sites there. [ ]
【单选题】在假设检验中,统计检验的显著性水平 α 的值是
【单选题】下列关于假设检验的有关结论哪项是正确的( )。
A.
检验中显著性水平α是犯“以真为假”的错误(即第一类错误)的概率
B.
进行假设检验时,选取的检验统计量不能包含总体分布中的任何参数
C.
用u检验法进行两个总体均值的比较检验时,要求方差相等
D.
统计软件作假设检验时一般给出P值,若P>α,则在α水平下拒绝H0
【简答题】With the______(develop)of tourism, more and more people are traveling all over the world.
【单选题】在假设检验中,统计检验的显著性水平α的值是
【单选题】下列关于麻醉性镇痛药说法正确的是
B.
可在胎儿娩出前2-3小时使用哌替定为产妇镇痛