Need help with Business Analysis- Quality Control question.?

Would I use a xbar, r, p or c chart? Please help. Thx!

DataRite Inc. is a large data processing center. It wishes to set up control limits for the proportion of records which have data entry errors. Accordingly, the section supervisor chooses 100 records each day over a 10-day period. The number of records (out of 100) which have errors on each of the 10 days is shown below:

Carpet # 1 2 3 4 5 6 7 8 9 10
# of records 5 7 8 4 9 6 7 3 5 6

Set up two-sigma control limits for the proportion of records with errors.

This would be a np-chart (or if you mean r-chart) based on the binomial distribution. It could also be the more general p-chart .
Find the average r = 危defectives=# of samples = 60/10 = 6
For an np (or r) chart:
6 卤 2鈭?6(1-0.06))
UCL = 10.75
LCL = 1.25
For a p-chart:
The average proportion, phat = 危defective/total tested = 60/1000 = 0.06
Control limits:
phat 卤 2鈭?phat(1-phat)/n)
= 0.06 卤 2鈭?0.06(0.94)/100)
UCL = 0.1075
LCL = 0.0125

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