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A survey of 77 commercial airline flights of under 2 hours resulted in a sample average...

A survey of 77 commercial airline flights of under 2 hours resulted in a sample average late time for a flight of 2.52 minutes. The population standard deviation was 12 minutes. Construct a 95% confidence interval for the average time that a commercial flight of under 2 hours is late. What is the point estimate? What does the interval tell about whether the average flight is late?

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