Historically, the Average Time to Service a Customer Complaint Has

question 30

Multiple Choice

Historically, the average time to service a customer complaint has been 3 days and the standard deviation has been 0.50 day. Management would like to specify the control limits for an X- chart with a sample size of 10 and 3 sigma limits. Suppose the next sample of 10 yielded the following result:
3.2, 2.1, 3.6, 2.8, 3.9, 3.5, 2.7, 4.1, 2.6, and 3.3.
What conclusion can be drawn?

• A) The sample size should be increased.
• B) Assuming the process variability is in control, the process average is also in statistical control.
• C) Assuming the process average is in control, the process average is out of statistical control.
• D) No conclusion can be drawn because there is insufficient data.