Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows:

-What is the central line of the R chart for this process?
A)0.23
B)0.19
C)0.44
D)0.25
E)0.06

Question

Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows:
 
-What is the central line of the R chart for this process?
A)0.23 
B)0.19 
C)0.44 
D)0.25 
E)0.06

Quizplus · Accepted Answer

The central line of an R chart is typically the average range of the samples. Without additional context or data, the most reasonable assumption is that the central line is the average of the provided options, which is closest to 0.25.

Sample Means and Ranges Were Obtained for Five Samples of 10