A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. Over the last hundred sample means,one sample mean was outside a control limit. The process is ________.
A)out of control
B)in control
C)highly variable
D)showing an assignable cause

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The Answer of A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. Over the last hundred sample means,one sample mean was outside a control limit. The process is ________.
A)out of control
B)in control
C)highly variable
D)showing an assignable cause

A Quality Control Chart Is Used to Monitor the Customer