lucky2019-12-29 10:35:36
lucky第35题完全不懂。。。求老师解答
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Evian, CFA2019-12-30 02:20:51
Evian, CFALucky 同学你好，
你发的图我看不清，麻烦抽空重新上传一下，谢谢~
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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 variances.
CFA Institute. 2020 CFA Program Level I Volume 1 Ethical and Professional Standards and Quantitative Methods (Kindle 位置 17763-17766).
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本题在考查“pooled estimator”的定义：
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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+上传图片