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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

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