SOLUTION: The lifetime of a certain brand of battery is known to have a standard deviation 16 of hours. Suppose that a random sample of 80 such batteries has a mean lifetime of 43.5 hours.
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-> SOLUTION: The lifetime of a certain brand of battery is known to have a standard deviation 16 of hours. Suppose that a random sample of 80 such batteries has a mean lifetime of 43.5 hours.
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Question 324784: The lifetime of a certain brand of battery is known to have a standard deviation 16 of hours. Suppose that a random sample of 80 such batteries has a mean lifetime of 43.5 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.
