Question: A control chart needs to be developed to determine if the temperature for a process is within control limits. Five samples each having 4 observations

A control chart needs to be developed to determine if the temperature for a process is within control limits. Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F) are noted in the table below:

Sample

Observation 1

Observation 2

Observation 3

Observation 4

1	250	253.5	249	251.2
2	252	250.3	252	249.5
3	247.6	251	250	249.8
4	253.5	249	251	250.3
5	252	248.5	249.8	250.7

What is the value of the average range R-bar?

A. 3.12

B. 5.25

C. 3.68

D. 6.34

E. 8.39

please read chart from right to left. sorry it was formatted incorrect

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