Find sigma upper and lower control chart limits for process


Problem:

C&A wants to see if the accuracy of the prices that were entered into its database used for its cash registers is in control. C&A collects 5 weeks of data as shown below.

Week

Incorrect Price Entries

1

15

2

7

3

5

4

10

5

10

Required:

Question 1) The 3-sigma upper and lower control chart limits for this process would be

i) UCL = 9.4; LCL =0
ii) UCL = 9.4; LCL = 1.9    
iii) UCL = 18.6; LCL = 0.2
iv) UCL = 18.6; LCL = 0
v) cannot be determinde

Solve the problem and show all work.

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Operation Management: Find sigma upper and lower control chart limits for process
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