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P Chart Self Study Slides

# P Chart Self Study Slides - P Chart Slides MGT 3360 Revised...

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1 P Chart Slides MGT 3360 Revised 04/10/08 See Technical Note 8 in your text for more information on P-charts

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2 Making a Percentage Defective Control Chart (P-Chart) Please work the next few slides for the airline problem You will want to print the “formula sheet” from BB (it is in its  own file in the Quality folder) before you work these  slides You will learn how to find the following using the formula  table 1) Pbar which is also CL 2) UCL 3) LCL
3 Formulas This is a separate Microsoft word document in BB too, it might be easier to print with Word?

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4 The next few slides will help you work through the P-Chart Airline Example The airline company you work for is concerned about on-time departures, since on- time departures decrease the late arrival rates. The Cullowhee hub experiences 100 flights each day of the week, with the following record of late departures for the previous five weeks: 10, 1, 4, 4, 7, 9, 9, 1, 1, 10, 7, 1, 4, 3, 1, 5, 10, 7, 9, 7, 1, 1, 10, 7, 1
5 General Procedure for Using P-Charts 1. Determine how many samples you have/need 2. Determine the size of each sample (n) you have/need 3. Take a random sample from the process (if you need to collect data) 4. Measure the quality characteristic 5. Determine how many samples you have (this may have been done for you in 1. above) 6. Determine the size of each sample (n) (this may have been done for you in 2. above) 7. Find Pbar 8. Find UCL P and LCL P 9. Find the Ps and plot the data on the chart 10. If you conclude that the process is out of control, look for assignable causes, eliminate the causes, reconstruct the chart with new data and continue to monitor the process (The following slides lead you through each of these steps)

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6 These steps have been done for you 1. Determine how many samples you have/need 2. Determine the size of each sample (n) you have/need 3. Take a random sample from the process (if you need to collect data) 4. Measure the quality characteristic
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