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Flight Arrivals Listed below are the arrival delay times (min) of randomly selected American Airlines flights that departed from JFK in New York bound for LAX in Los Angeles. Negative values correspond to flights that arrived early and ahead of the scheduled arrival time. Use these values for Exercises 1–4.

Confidence Interval Construct a 95% confidence interval estimate of the mean arrival delay time for the population of all American Airlines flights from JFK to LAX.

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Step 1

The t test will use to obtain the 95% confidence interval. The sample size n = 12

The mean and standard deviation of the data can be obtained as:

Step 2

The degree of freedom = n – 1 = 12 – 1 = 11

The t value at 95% confidence leve...

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