S
siouxan
Here is my question, what make sense in measuring total QA for statistical measurement purposes:
For example, if a certain part (SMD) has 5000 pcs order, the production sends 1000 pcs with an outgoing record (sheet) every day to tape & reel packing room. QA operators in T&R do a visual inspection every day for a total of 5 times Monday through Friday (5 X 1000=5000 pcs, 5 record sheets, 5 lots).
Which formula / method is correct?
(1) If one lot (1000 pcs on certain day) is rejected, then the reject rate is 1/1=100% for all 5000 pieces?
(2) Or If one lot (1000 pcs on a certain day) is rejected, the reject rate is 1/5=20%, not 100%?
For example, if a certain part (SMD) has 5000 pcs order, the production sends 1000 pcs with an outgoing record (sheet) every day to tape & reel packing room. QA operators in T&R do a visual inspection every day for a total of 5 times Monday through Friday (5 X 1000=5000 pcs, 5 record sheets, 5 lots).
Which formula / method is correct?
(1) If one lot (1000 pcs on certain day) is rejected, then the reject rate is 1/1=100% for all 5000 pieces?
(2) Or If one lot (1000 pcs on a certain day) is rejected, the reject rate is 1/5=20%, not 100%?