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

question 36

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

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