Confidence interval estimate of true population mean life
A sample of 270 batteries for a hand-held computer has a sample mean life of 56.0 hours and a sample standard deviation = 5.60 hours, find the upper limit of a 98% confidence interval estimate of the true population mean life.
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it is known that x is normally distributed with mean 12.1 minutes and standard deviation 3.8 minutes, under ordinary traffic conditions. what is the probability that a single car chosen at random will travel through the tunnel in 10 minutes?
Refer to the following information and output. What is the probability that the service facility will be idle?
A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 99% confident that her estimate is correct. If the standard deviation is 4.09, how large a sample is needed to get the desired informati
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Flights arriving at the airport spend anywhere from 50 to 130 minutes in security before unloading passengers. If the unloading times follow the uniform probability distribution, find the average unloading time.
To determine whether or not they have a certain disease, 150 people are to have their blood tested. However, rather than testing each individual separately.
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