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Problem: Using four samples of 2 0 0 credit card statements each, an auditor found the following number of erroneous statements in each sample: Sample
Problem: Using four samples of credit card statements each, an auditor found the following number of erroneous statements in each sample:
Sample
Number of errors
a Determine the proportion of defectives in each sample.
Sample Number of errors Proportion defective
b Estimate the proportion of defectives mean defectives and standard deviation of the sampling distribution sigma p for this process?
c Construct a pcontrol chart for the process considering the information in part c and three Sigma control limits Is the process in control?
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