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The airborne times (in minutes) for United Airlines Flight 448 from Albuquerque to Denver on 64...

The airborne times (in minutes) for United Airlines Flight 448 from Albuquerque to Denver on 64 randomly selected days to have the mean 54.2 min and standard deviation 13.5 min. What is the level of the confidence interval (51.77, 56.63)?

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