Please help with question> Thanks

timer Asked: Jun 21st, 2015

Question Description

The lifetime of a certain brand of battery is known to have a standard deviation of 

 hours. Suppose that a random sample of 

 such batteries has a mean lifetime of 

 hours. Based on this sample, find a 

 confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below.

What is the low limit of 90% confidence interval? What is the upper limit of 90% confidence interval? Round answer

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