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The National Report on Human Exposure to Environmental Chemicals (Repo.pdf

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The National Report on Human Exposure to Environmental Chemicals ( Report ) presents nationally representative, cumulative biomonitoring data. In each survey period, the reported chemicals or their metabolites were measured in blood, serum, and urine samples from random subsamples of the National Health and Nutrition Examination Survey (NHANES). These subsamples typically consisted of about 2,500 participants that are divided into subgroups according to age, sex, and race/ethnicity. What type of sampling method does this report employ? A. Systematic Sampling B. Stratified Sampling C. Simple Random Sampling D. Quota Sampling.

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The National Report on Human Exposure to Environmental Chemicals ( Report ) presents nationally representative, cumulative biomonitoring data. In each survey period, the reported chemicals or their metabolites were measured in blood, serum, and urine samples from random subsamples of the National Health and Nutrition Examination Survey (NHANES). These subsamples typically consisted of about 2,500 participants that are divided into subgroups according to age, sex, and race/ethnicity. What type of sampling method does this report employ? A. Systematic Sampling B. Stratified Sampling C. Simple Random Sampling D. Quota Sampling

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