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 lower control limit (LCL) for this chart?
A) 47.60
B) 56.15
C) 57.15
D) 58.05

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 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 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 lower control limit (LCL) for this chart?
A) 47.60 
B) 56.15 
C) 57.15 
D) 58.05

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