Case2 Alabama Airlines

Case2 Alabama Airlines - CASE 2: Alabama Airlines ALABAMA...

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CASE 2: Alabama Airlines ALABAMA AIRLINES’ ON-TIME SCHEDULE 1. The overall percent of late flights ( p ) and the control limits are developed as follows: Total number of late flights 120 0.04 Number of samples Sample size 30 100 (1 ) 0.04 0.96 0.0196 100 p p pp n σ == ×× −× = = Then the control limits are given (for a 95% confidence interval; 95% = 1.96) by: Sample Late Flights Percentage of Late Flights Percentage ( n /100) in Sample Late Flights ( n /100)* Sample in Sample of Late Flights 1 2 0.02 16 2 0.02 2 4 0.04 17 3 0.03 3 10 0.10 18 7 0.07 4 4 0.04 19 3 0.03 5 1 0.01 20 2 0.02 6 1 0.01 21 3 0.03 7 13 0.13 ** 22 7 0.07 8 9 0.09 23 4 0.04 9 11 0.11 ** 24 3 0.03 10 0 0.00 25 2 0.02 11 3 0.03 26 2 0.02 12 4 0.04 27 0 0.00 13 2 0.02 28 1 0.01 14 2 0.02 29 3 0.03 15 8 0.08 30 4 0.04 * Bold-faced entries indicate sample fractions outside the quality control limits. **Indicates sample fractions outside the industry standard quality control limits. UCL 1.96 0.04 1.96 0.0196 0.0784 LCL 1.96 0.04 1.96 0.0196 0.0016 p p p p =+ = + × = =− = × = 2,3. Both the table presented in the left column, and the control chart below indicate that the quality requirements of Al-
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This note was uploaded on 09/08/2010 for the course BUS 140 at San Jose State University .

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Case2 Alabama Airlines - CASE 2: Alabama Airlines ALABAMA...

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