TABLE 18-3
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 18-3,suppose the analyst constructs an chart to see if the production process is in-control.What is the lower control limit (LCL)for this chart?
A)47.60
B)56.15
C)57.15
D)58.05

Question

TABLE 18-3
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 18-3,suppose the analyst constructs an  chart to see if the production process is in-control.What is the lower control limit (LCL)for this chart?
A)47.60 
B)56.15 
C)57.15 
D)58.05

Quizplus · Accepted Answer

The Answer of TABLE 18-3
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 18-3,suppose the analyst constructs an  chart to see if the production process is in-control.What is the lower control limit (LCL)for this chart?
A)47.60 
B)56.15 
C)57.15 
D)58.05

TABLE 18-3 A Quality Control Analyst for a Light Bulb Manufacturer Is