TABLE 17-3
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 Table 17-3,suppose the analyst constructs an chart to see if the production process is in-control.What is the center line for this chart?
A)64.3
B)59.5
C)58.0
D)57.1

Question

TABLE 17-3
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 Table 17-3,suppose the analyst constructs an  chart to see if the production process is in-control.What is the center line for this chart?
A)64.3 
B)59.5 
C)58.0 
D)57.1

Quizplus · Accepted Answer

Since an individuals chart is used for range, the center line is equal to the average range, which in this case is 58.0.

TABLE 17-3 A Quality Control Analyst for a Light Bulb Manufacturer Is