Consider a p-chart measuring the percentage of defective light bulbs. If the LCL is .04 and a sample has 1% defects, what is the implication?
A) The process is in a state of control.
B) The process is out of control even though the variation is "good."
C) The value of sigma must be increased.
D) The process has too many errors.
E) A calculation error must have occurred.

Question

Quizplus · Accepted Answer

The LCL (Lower Control Limit) is the threshold at which the process is considered to be out of control. Since the sample has only 1% defects, which is below the LCL of 4%, the process is out of control, even though the variation may be "good." This suggests that further investigation and corrective action are necessary to bring the process back into control.

Consider a P-Chart Measuring the Percentage of Defective Light Bulbs