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a researcher wants to determine the average time it takes to achieve 100% signal strength of...

a researcher wants to determine the average time it takes to achieve 100% signal strength of a pressure sensor. He plans to measure a sample with 95% confidence that the mean of his sample is off by at most 0.75 min. If he presumes from pressure sensor manufacturer that μ=1.6min, how large a sample will he have to take

math   Statistics-And-Probability   
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