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 average?
A) 100.20
B) 102.00
C) 99.88
D) 98.00
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 average?
A) 100.20 
B) 102.00 
C) 99.88 
D) 98.00 
E) cannot be determined from the information given

Quizplus · Accepted Answer

The center line for the chart that will monitor the process average is the average of the sample means. 
Adding up all the sample means and dividing by 8 gives us: 
(98.6 + 100.5 + 99.4 + 99 + 99.9 + 99.2 + 100.4 + 100) / 8 = 99.88
Therefore, the center line is 99.88, which is closest to option C.

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