Can anyone help with my Statistic Homework

Posted on 2014-03-11 08:07:00 in Statistics by JOE

2. A manufacturer of rechargeable laptop batteries markets its batteries as having, on average, 500 charges. A consumer group decides to test this claim by assessing the number of times 30 of their laptop batteries can be recharged and finds the average is 497, with a standard deviation of 10.



The resulting p-value is .1111; thus, the null hypothesis is not rejected. The consumer group concludes that the manufacturer’s claim that its laptop batteries can be recharged, on average, 500 times is accurate.



What type of error is possible in this situation?



A type I

B type II

C neither

D both



3. A 2011 survey, by the Bureau of Labor Statistics, reported that 91% of Americans have paid leave. In January 2012, a random survey of 1000 workers showed that 89% had paid leave.



The resulting p-value is .0271; thus, the null hypothesis is rejected. It is concluded that there has been a decrease in the proportion of people, who have paid leave from 2011 to January 2012.



What type of error is possible in this situation?



A type I

B type II

C neither

D both



4. Suppose the results indicate that the null hypothesis should be rejected; thus, it is possible that a type I error has been committed.



Given the type of error made in this situation, what could researchers do to reduce the risk of this error?



A, Choose a .01 significance level, instead of a .05 significance level.

B Increase the sample size.



5. Suppose the results indicate that the null hypothesis should not be rejected; thus, it is possible that a type II error has been committed.



Given the type of error made in this situation, what could researchers do to reduce the risk of this error?



A Choose a .01 significance level, instead of a .05 significance level.

B Increase the sample size.

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