Consider a situation where the lower control limit of a percent defective chart is negative. It must be that ________.
A)the absolute value of the negative LCL must be taken to arrive at a positive value
B)an error was made in computing the LCL because negative values are impossible
C)the process is out of control and must be redesigned
D)the lower limit is set to zero

Question

Quizplus · Accepted Answer

When the lower control limit (LCL) of a percent defective chart is calculated to be negative, it is standard practice to set the LCL to zero because the percentage of defects cannot be negative. This adjustment is made to maintain the logical integrity of the control chart.

Consider a Situation Where the Lower Control Limit of a Percent