The data collected regarding the number
of castings produced and number of casting
rejected because of casting defects and machining
defects as shown in Table 1 and illustrated by
graphically. It is shown in Fig 1.
P – Chart was drawn using the data
shown. It shows that few sample points are not
close to process average, there is tolerance, but
only the aim of zero defect (or) 100% acceptable
items. The simplistic measure of capability can
hence be provided by the relevant mean value