# Question: Efforts by airlines to improve on time arrival rates are showing

Efforts by airlines to improve on-time arrival rates are showing results. Boston.com (December 22, 2012) reports that in the first 10 months of 2012 on-time arrival rates at U.S. airports were the highest they have been since 2003; during this period 82% of flights landed within 15 minutes of their scheduled time. Are there differences among the major airlines? The following data show the number of on-time arrivals for samples of flights taken from seven major U.S. airlines (American Airlines, Continental Airlines, Delta Air Lines, JetBlue Airways, Southwest Airlines, United Airlines, and US Airways) in 2012.
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a. Use the sample data to calculate the point estimate of the population proportion of on-time arrivals for each of these seven airlines.
b. Conduct a hypothesis test to determine if the population proportion of on-time flights in 2012 is equal for these seven airlines. Using a .05 level of significance, what is the p-value and what is yourconclusion?
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