SCENARIO 19-3 A Quality Control Analyst for a Light Bulb Manufacturer Is

Multiple Choice

SCENARIO 19-3
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 Scenario 19-3,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.