Please help with question! Thanks

timer Asked: Jun 21st, 2015

Question Description

Need answer quick please.  thanks

The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 70 such batteries has a mean lifetime of 35.8 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. 

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