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 centre line of this R chart?
A) 7.1
B) 6.9
C) 4.8
D) 6.0
Correct Answer:
Verified
Correct Answer:
Verified
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