# Statistics

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University Hospital has been concerned with the number of errors found in its billing statements to patients. An audit of 100 bills per week over the past twelve weeks revealed the following number of errors:

Week Number of Errors

1 4
2 5
3 6
4 6
5 3
6 2
7 6
8 7
9 3
10 4
11 3
12 4

What type of chart should be used?
p-chart
R-chart
x-bar chart
c-chart

Develop control charts with z = 3: (a) CL, (b) UCL, (c) LCL.
Note. If the lower control limit is negative, round the LCL to zero.
(a) errors (Round your answer to 2 decimal places, the tolerance is +/-0.01)
(b) (Round your answer to 2 decimal places, the tolerance is +/-0.05)
(c) (Round your answer to 2 decimal places, the tolerance is +/-0.05)

Is the process in control?
The process is in control
The process is not in control

• Statistics -

P chart

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