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The manager of the service department of a local car dealership has noted that the service...

The manager of the service department of a local car dealership has noted that the service times of a sample of 30 new automobiles has a standard deviation of 7 minutes. A 99% confidence interval estimate for the standard deviation of the service times for all their new automobiles is 16.047 to 45.722 4.778 to 8.066 22.93 to 96.31 27.1520 to 108.299

Math   Statistics-And-Probability   
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