Supplementary Problem 18.15
A bottledwater company has been randomly inspecting bottles of
water to determine whether they are acceptable for delivery and
sale. The inspectors are looking at water quality, bottle
condition, and seal tightness. A series of 10 random samples of 50
bottles each is taken. Some bottles are rejected. Use the following
information on the number of bottles from each batch that were
rejected as being out of compliance to construct a p
chart.



create a p chart.
The proportion of non confirming bottles in each of the 10 samples drawn here is computed as:
Sample  N  Number out of Compliance  Proportion of out of compliance bottles 
1  50  3  0.06 
2  50  11  0.22 
3  50  7  0.14 
4  50  2  0.04 
5  50  5  0.1 
6  50  8  0.16 
7  50  0  0 
8  50  9  0.18 
9  50  1  0.02 
10  50  6  0.12 
The given last column was plotted against the sample number to get the pchart as:
The various metrics above are computed here as:
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