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 X bar chart for the process is approximately (for a sample size of 8, A₂ = 0.373) :

A) 42.95
B) 43.25
C) 43.46
D) 42.50
E) 41.75