A First Course in Quality Engineering, 2nd Edition

Quality in Procurement 439

An example page containing OC curves, as graphs and tables, is reproduced

in Figure 7�11�

Example 7.7

Choose the SSPs for normal, tightened, and reduced inspection if the lot size is

200 and the AQL is 2.5%.

Solution

From Table 7.2, the code letter for the given lot size is G. The SSP for normal

inspection from Table 7.3 is:

n c r, , : , , ,

( ) ( )

32 2 3

where n, c, and r indicate sample size, acceptance number, and rejection number,

respectively. Similarly, the SSP for tightened inspection from Table 7.4 is (32, 1, 2),

and the plan for reduced inspection from Table 7.5 is (13, 1, 3).

Note that for the normal and tightened ...