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