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

Question

Quizplus · Accepted Answer

The Answer of 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

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