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Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart...

Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart for control. The samples and the number of defectives in each are shown in the following table:

SAMPLE n NUMBER OF DEFECTIVE ITEMS IN THE SAMPLE
1 15 1
2 15 1
3 15 3
4 15 1
5 15 0
6 15 0
7 15 2
8 15 1
9 15 2
10 15 1


a. Determine the p−p− , Sp, UCL and LCL for a p-chart of 95 percent confidence (1.96 standard deviations). (Leave no cells blank - be certain to enter "0" wherever required. Round your answers to 3 decimal places.)

b. What comments can you make about the process?

  • Process is out of statistical control.

  • Process is in statistical control.

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