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Five data entry operators work of Data Processing department each day for 20 working days the number of defective records in a sample of 250

Five data entry operators work of Data Processing department each day for 20 working days the number of defective records in a sample of 250 records typed by these operators has been noted, as follows:
SampleNo. No. Defective SampleNo. No. Defective
1 7 11 12
2 5 12 5
3 10 13 20
4 10 14 4
5 11 15 11
6 8 16 8
7 6 17 12
8 9 18 4
9 6 19 6
10 13 20 25
a) Establish a three-sigma control chart for monitoring the number of defective records.

.0749

.0019

What is the upper limit?
What is the lower limit?
b) Based on the chart created in (a), was there any day when the process was not in control? Which days?
c) What action or corrective action would you suggest to eliminate the out of control event?
d) The industry standards are 0.10 and 0.01, respectively. What does this imply about Georgia Bank's own standards?

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