A manufacturing company makes runners for cabinet drawers. To assess the quality

Question

A manufacturing company makes runners for cabinet drawers. To assess the quality of the manufacturing process, the company collected one sample of 300 consecutively manufactured runners each day for 20 days and counted the number of defective items. The resulting sample data are:

Sample:             1      2      3      4      5      6      7      8      9    10
Sample Size:   300 300 300 300 300 300 300 300 300 300
Defectives:        8       6     11    15    12    11     9      6      5      4

The value of the center line for a p control chart using the above data is

Explanation / Answer

Center value for p = (8 + 6 + 11 + 15 + 12 + 11 + 9 + 6 + 5 + 4)/(10*300) = 87/3000 = 0.029

Hence,

Center line of p control chart = 0.029

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