It seems you are looking for a specific document: "Cercetări de marketing – Tratat" by Iacob Cătoiu, and specifically page 81 or a PDF containing that page.
Rating: ★★★★★ (5/5) – Essential reading for Romanian marketing students; a timeless methodological reference. cercetari de marketing tratat iacob catoiu pdf 81
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Evolution of concepts, definitions, and the role of information in marketing. Research Design Definitions of sampling frame, sample size, sampling error
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