Since I received a couple of emails regarding the sampling post, I'd like to mention an auditor's portal caled "AuditNet" and the publisher John Wiley. The AuditNet site has a link to an Excel file which calculates sample sizes for a variety of techniques. John Wiley publishers were the go to company when I studied sampling theory. I browsed Amazon and they have the classics (in used condition) as well as some newer books.
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