The National Health and Nutrition Examination Survey (NHANES) assesses the health and nutritional status of Americans. A recent NHANES asked a random sample of 17,567 American adults to fill out a detailed questionnaire about what they ate the previous day and give their body mass index (BMI). The researchers then compared individuals who ate avocado with those who didn't, and found that BMI was lower, on average, among those who ate avocado. This study is an example of

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This study is an example of a survey using a probability sample because it involves asking a random sample of individuals to provide information about their diet and BMI, which is a common method in survey research to generalize findings to a larger population.

The National Health and Nutrition Examination Survey (NHANES) Assesses the Health