TABLE 17-3 A Quality Control Analyst for a Light Bulb Manufacturer Is

question 86

Multiple Choice

TABLE 17-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic. Accordingly, the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.

-Referring to Table 17-3, suppose the sample mean and range data were based on 11 observations per day instead of 10. How would this change affect the lower and upper control limits of the R chart?

• A) LCL would increase; UCL would decrease.
• B) LCL would remain the same; UCL would decrease.
• C) Both LCL and UCL would remain the same.
• D) LCL would decrease; UCL would increase.

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Definitions:

Epicondylitis

A painful condition affecting the elbow, often referred to as "tennis elbow," involving inflammation of the tendons that join the forearm muscles to the outside of the elbow.

Corticosteroid

A class of steroids that reduces inflammation in the body and is used in treating a variety of conditions including allergies and autoimmune diseases.

Strain

A stretched or torn muscle or tendon, often resulting from overuse or injury.

Torticollis

Stiff neck caused by spasmodic contraction of neck muscles drawing the head to one side with the chin pointing to the other; can be congenital or acquired.