Question: A major airline company is concerned that its proportion of late arrivals has substantially

increased in the past month. Historical data shows that on the average 18% of the

company airplanes have arrived late. In a random sample of 1,240 airplanes, 310

airplanes have arrived late. If we are conducting an hypothesis test for a single

proportion to the determine if the proportion of late arrivals has increased, what is the

value of the calculated test statistic? Conduct the test of hypothesis for this situation and

be sure to include all the steps and intermediate calculations.

1. Z = 6.416
2. Z = 3.208
3. Z =- 3.208
4. Z = -6.416
5. Z =1.833

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