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**Power test**

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**abc46167****Guest**

A hard disk manufacturer advertises that the probability of its product being returned for defects during warranty period is 1%. In a sample of 2000, 26 end up being returned for defects.

a) At 5 % significance level, test the null hypothesis return rate is 1% against the alternative that the defect rate is not 1%.

b) At 5 % significance level, test the null hypothesis return rate is 1% againts the alternative that the defect rate is greater than 1%.

C) Which of the 2 test has more power?

**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

b is more powerful, definately.

But without the Standard Deviation around 1%, none could do such a test.

**X'(y-Xβ)=0**

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**Power test**