Question: A Quality Analyst wants to construct a control chart for determining whether errors in bank transactions are under control. She looked at samples of 1000

A Quality Analyst wants to construct a control chart for determining whether errors in bank transactions are under control. She looked at samples of 1000 transactions each week, for four weeks in a row. A transaction was considered defective, if the analyst detected any error in the transaction. Week Total Defectives 1 23 2 15 3 29 4 13 What is the standard deviation of the sample proportions of defective transactions

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