董同学2020-03-18 16:53:59
18.单选题 收藏 标记 纠错 A pooled estimator is used when testing a hypothesis concerning the: A equality of the variances of two normally distributed populations. B difference between the means of two at least approximately normally distributed populations with unknown but assumed equal variances. C difference between the means of two at least approximately normally distributed populations with unknown and assumed unequal SP这个知识点 我怎么感觉老师上课的时候没讲过呢
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Evian, CFA2020-03-18 18:51:22
董同学你好,
其实PPT讲义中是有的。
如图,Sp的平方就是pooled estimator(综合估计量),是在:
1.检验两个正太分布的总体均值是否相等
2.其中总体方差未知但是假定相等
这两个条件下使用的
考纲不要求掌握其公式,但是题目如果给出公式,要求你会带入数值计算的,定性也是要掌握的,就是截图内的信息记住即可。
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