Use the Information Contained in This Chart to Determine Your

Multiple Choice

Use the information contained in this chart to determine your answer. Twenty samples of size 8 were taken from a stable process. From past studies of the process, you know that the overall mean is 42.5 and that the average of the samples range is 2.0.

-The LCL for the three sigma R chart for the process is approximately (for a sample size of 8, D₃ = 0.136, D₄ = 1.864) :

A) 2.00
B) 0.45
C) 0.27
D) 3.55
E) 3.73