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Lab technician testing human DNA samples for potential viruses including pandemics and Covid-19 in the lab. crowd behaviors measuring social sampling statistics experiment population research of society Notepad with marks about sampling bias. Sampling designs or sampling method for random, stratified, systematic, cluster sampling Vector illustration of sample from population isolated on a white background. Simple random sampling from a target population. Group of people and sample selection. Statistical research methodology. Sampling, sign series for digital video, audio, recording and co Stratified sampling example, illustration diagram, transparent background. Research method explanation scheme with person symbols and stages. People crowd in form of pie chart composed of people. Statistic concept. sampling icon Soil Test. Female Agronomist Taking Notes In The Field Population sampling for business research, concept. marketing goals, customer care services, customer relationship management (CRM), market segmentation, big data discovery, access personal data Shot of an unrecognizable ecologist standing where sewage waste water meets the river and taking samples to determine level of contamination and pollution.