Instruction 18-9 A Quality Control Analyst for a Light Bulb Manufacturer Is

question 115

Multiple Choice

Instruction 18-9
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 Instruction 18-9,suppose the analyst constructs an R chart to see if the variability in production times is in control.What is the upper control limit for this R chart?

• A)6.34
• B)7.98
• C)10.66
• D)9.37

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