Jack Joyner, Director of Quality Control at Covington Castings (CC), is designing a c chart to monitor the number of nonconformances per aluminum casting produced at CC.The total number of nonconformances for 26 castings is 91.The lower control limit for Jack's c chart is ___________.
A)1.37
B)-2.11
C)3.50
D)-1.00
E)0.00

Question

Quizplus · Accepted Answer

The lower control limit (LCL) for a c chart is calculated as c-bar - 3√c-bar. Since the number of nonconformances cannot be negative, if the calculated LCL is negative, it is set to 0.00.