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What is the lower limit of the confidence interval

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Reference no: EM132464656

Problem: The lifetime of a certain brand of air filter is known to have a standard deviation of 23 hours. Suppose that a random sample of 90 such air filters has a mean lifetime of 40.9 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all air filters of this brand. Then complete the table below.

Carry your intermediate computations to at least three decimal places.

What is the lower limit of the 90% confidence interval?

What is the upper limit of the 90% confidence interval?

Reference no: EM132464656

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