问题如下图:
选项:
A.
B.
C.
解释:
老师 我们上课时候背的99%的置信区间对应的点是2.58。有时候做题确实是这样的,但是这道题确实0.995,咋整。
星星_品职助教 · 2019年10月08日
同学你好,
对于这个置信区间对应的几个值,背下来的同时还需要理解。置信区间永远对应的是“两边”,也就是说,中间的区间占了99%,剩下两边一共占1%,也就是单边是0.5%。
而这道题问的是:大于12.32%的概率,即标准化后大于2.58的概率。“大于”对应着是右边那单边,所以对应概率就是0.5%,而不是1%。
其实背的分位点1.65,1.96,2.58,本质上也是查表查出来的。如果这道题没有记住2.58对应99%置信区间,也可以去查Z表,可以对应出2.58对应的左侧面积是99.5%,所以“大于”的部分也就是右侧就是0.5%。
所以关键还是要理解。加油
NO.PZ2015120604000178 问题如下 BIM is a well-velopepublic company anits market capitalization growth rates over past few cas are normally stributeThe population ha meof 10% ana stanrviation of 5.4%. investor wants to figure out the probability thBIM's average capitalization growth rate will over 12.32% in the next three years (all the ta are monthly statistics).Whiof the following option is most accurate? A.0.5%. B.1%. C.5%. A is correct. It is appropriate to use the centrlimit theroy to calculate.Stanrerror=5.4%/36\sqrt {\rm{36}}36P(X>12.32%)=P(Z> (12.32%-10%)/0.009)=P(Z>2.58). So the corresponng probability is 0.5%. 本题是求增长率大于12.3%的概率,为什么会用标准误来表示概率?
NO.PZ2015120604000178问题如下BIM is a well-velopepublic company anits market capitalization growth rates over past few cas are normally stributeThe population ha meof 10% ana stanrviation of 5.4%. investor wants to figure out the probability thBIM's average capitalization growth rate will over 12.32% in the next three years (all the ta are monthly statistics).Whiof the following option is most accurate?A.0.5%.B.1%.C.5%. A is correct. It is appropriate to use the centrlimit theroy to calculate.Stanrerror=5.4%/36\sqrt {\rm{36}}36P(X>12.32%)=P(Z> (12.32%-10%)/0.009)=P(Z>2.58). So the corresponng probability is 0.5%. 看不懂这道题的提干意思以及求解的顺序和逻辑,请老师解答的详细一些,谢谢
NO.PZ2015120604000178问题如下BIM is a well-velopepublic company anits market capitalization growth rates over past few cas are normally stributeThe population ha meof 10% ana stanrviation of 5.4%. investor wants to figure out the probability thBIM's average capitalization growth rate will over 12.32% in the next three years (all the ta are monthly statistics).Whiof the following option is most accurate?A.0.5%.B.1%.C.5%. A is correct. It is appropriate to use the centrlimit theroy to calculate.Stanrerror=5.4%/36\sqrt {\rm{36}}36P(X>12.32%)=P(Z> (12.32%-10%)/0.009)=P(Z>2.58). So the corresponng probability is 0.5%. 这道题为什么不考虑大于,按照单尾 1% 选择
NO.PZ2015120604000178 问题如下 BIM is a well-velopepublic company anits market capitalization growth rates over past few cas are normally stributeThe population ha meof 10% ana stanrviation of 5.4%. investor wants to figure out the probability thBIM's average capitalization growth rate will over 12.32% in the next three years (all the ta are monthly statistics).Whiof the following option is most accurate? A.0.5%. B.1%. C.5%. A is correct. It is appropriate to use the centrlimit theroy to calculate.Stanrerror=5.4%/36\sqrt {\rm{36}}36P(X>12.32%)=P(Z> (12.32%-10%)/0.009)=P(Z>2.58). So the corresponng probability is 0.5%. 为什么用标准误来计算呢, 标准误在题干场景里是什么具体含义
NO.PZ2015120604000178问题如下BIM is a well-velopepublic company anits market capitalization growth rates over past few cas are normally stributeThe population ha meof 10% ana stanrviation of 5.4%. investor wants to figure out the probability thBIM's average capitalization growth rate will over 12.32% in the next three years (all the ta are monthly statistics).Whiof the following option is most accurate?A.0.5%.B.1%.C.5%. A is correct. It is appropriate to use the centrlimit theroy to calculate.Stanrerror=5.4%/36\sqrt {\rm{36}}36P(X>12.32%)=P(Z> (12.32%-10%)/0.009)=P(Z>2.58). So the corresponng probability is 0.5%. 请问到哪里找这个查表