Use the following table to answer the question(s) below.

-Close tolerances are required in the manufacturing section of an automotive parts business. Since the customers demand quality, the owner wants to monitor the operation closely using statistical process control. After taking 8 samples of size 4, the owner finds himself with the data in the table above. What is the center line for a chart that will monitor process dispersion?
A) 0.45
B) 0.30
C) 0.00
D) 0.75
E) cannot be determined from the information given

Question

Use the following table to answer the question(s) below.
 
-Close tolerances are required in the manufacturing section of an automotive parts business. Since the customers demand quality, the owner wants to monitor the operation closely using statistical process control. After taking 8 samples of size 4, the owner finds himself with the data in the table above. What is the center line for a chart that will monitor process dispersion?
A) 0.45 
B) 0.30 
C) 0.00 
D) 0.75 
E) cannot be determined from the information given

Quizplus · Accepted Answer

The center line for a range chart (R-chart) that monitors process dispersion is the average of the sample ranges. To find this, you would calculate the range for each sample, then find the average of these ranges. The problem states that the owner has data from 8 samples of size 4, but does not provide the actual data. However, if the average range was calculated to be 0.45, then that would be the center line for the R-chart.

Use the Following Table to Answer the Question(s) Below