Solution-What is the lower limit of the 90 confidence

What is the lower limit of the 90 confidence interval

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Truck drivers who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of truck drivers focused on quantifying deviations from regular sleep hours. A random sample of 28 professional truck drivers was interviewed, and the drivers in the sample reported the time at which they went to sleep on their most recent working day. The study gave the sample mean and standard deviation of the times reported by drivers, with these times measured in hours after midnight. (Thus, if the driver reported going to sleep at 11 p.m., the measurement was -1.) The sample mean was 0.8 hours, and the standard deviation was 1.8 hours. Assume that the sample is drawn from a normally distributed population. Find a 90% confidence interval for the population standard deviation, that is, the standard deviation of the time (hours after midnight) at which drivers go to sleep on their work days. 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: EM132461668

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What is the lower limit of the 90 confidence interval

Reference no: EM132461668

Reference no: EM132461668

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