小布衣NYC
统计问题求救
1631
6
2008-12-11 01:45:00
题目:
1. The ABC Company claims that the batteries it produces have useful life of more than 100 hours, with a known standard deviation (of population) of 20 hours. A test is undertaken to test the validity of this claim. Please set of hypotheses for this test?
2. In hypothesis testing, the hypothesis which is assumed to be true is called?
然后请各位高手解释一下这些答案的原理好吗? 谢谢!!!!!
还有我想请问一下,哪里可以找到一些关于Hypothesis Testing &Confidence Intervals 概念的题目, 因为我对概念比较模糊,谢谢了!!!!
the hypothesis which is assumed to be true is called Null Hypothesis，（虚无假设），也就是H0。
这个题目的H0：u>u0, σ＝σ0 （u和σ是根据你的样本推测出来的总体平均数和标准差，u0和σ0是它claim的值，u0＝100，σ0＝20。但是因为这里宣称的是平均寿命大于100个小时，所以我们检验的应该是u>u0，是个单侧t检验）
hope this helps.
题目:
1. The ABC Company claims that the batteries it produces have useful life of more than 100 hours, with a known standard deviation (of population) of 20 hours. A test is undertaken to test the validity of this claim. Please set of hypotheses for this test?
2. In hypothesis testing, the hypothesis which is assumed to be true is called?
然后请各位高手解释一下这些答案的原理好吗? 谢谢!!!!!
还有我想请问一下,哪里可以找到一些关于Hypothesis Testing &Confidence Intervals 概念的题目, 因为我对概念比较模糊,谢谢了!!!!
这个最基础的统计课本里就有啊～～
对, 我的答案也是跟你一样的,但是我们教授却说是H0 >=100,H1<100. 所以我才非常郁闷. 而且马上就要期末考了,老师还出这些乌龙的话,那就惨了
感觉就是抽取一个样本，然后检验样本的mean和SD跟总体的mean和SD是不是一样的。
the hypothesis which is assumed to be true is called Null Hypothesis，（虚无假设），也就是H0。
这个题目的H0：u>u0, σ＝σ0 （u和σ是根据你的样本推测出来的总体平均数和标准差，u0和σ0是它claim的值，u0＝100，σ0＝20。但是因为这里宣称的是平均寿命大于100个小时，所以我们检验的应该是u>u0，是个单侧t检验）
那你的答案也是Ha: u>100.H0: u<=100?
到底了
Hot Deals
All Deals