Six samples of five observations each have been taken and the results are listed below. Using the factors from the attached table 10-2, determine the upper and lower control limits for both of the X-bar and R charts,
1 2 3 4 5 6
79.20 80.50 79.60 78.90 80.50 79.70
78.80 78.70 79.60 79.40 79.60 80.60
80.00 81.00 80.40 79.70 80.40 80.50
78.40 80.40 80.30 79.40 80.80 80.00
81.00 80.10 80.80 80.60 78.80 81.10
X – BAR 79.48 80.14 80.14 79.60 80.02 80.38
RANGE 2.60 2.30 1.20 1.70 2.00 1.40
What is the R CL?
a. 3.94
b. 0.00
c. 1.8
d. 1.87
Expert Answer
Answer d. CL for R bar chart is 1.87
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