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 records the data in the table above. What are the lower and upper limits for a chart that will monitor process dispersion?
A) (0.00, 1.85)
B) (0.00, 2.11)
C) (0.00, 2.28)
D) (0.00, 1.03)
E) (0.00, 1.45)

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 records the data in the table above. What are the lower and upper limits for a chart that will monitor process dispersion?
A) (0.00, 1.85) 
B) (0.00, 2.11) 
C) (0.00, 2.28) 
D) (0.00, 1.03) 
E) (0.00, 1.45)

Quizplus · Accepted Answer

The lower and upper control limits for a range chart (R-chart) are calculated using the D3 and D4 factors for a sample size of 4. For n=4, D3=0 and D4=2.282. However, the closest option provided is (0.00, 1.03), which suggests a possible error in the options or a different interpretation.

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