You are going to develop an X-bar chart based on range statistics, and you are using a sample size of 12 for your charting purposes. Which of the following is the A2 factor for the X-bar chart? A. 0.37 B. 0.22 C. 0.18 D. 0.27 E. 0.31

D. 0.27

Step-by-step explanation:

An X-bar is a control chart used with processes that have a subgroup size of two or more. X - bar chart helps us to determine if a process is stable and predictable.It shows how the mean or average changes over time.

T o determine the A2 factor for the X-bar chart of a particular sample size, n, check the table of control chart constant.

For a sample size of 12, the A2 constant for the X-bar chart is 0.266

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14