NHANES surveys Sample size Sample mean Sample SD 2.486 2.408 5.851 Survey NHES II, 1965 NHANES II, 1980 NHANES, 2002 16.3 16.5 618 145 214 18.4
News reports speak of an emerging crisis of childhood obesity in the United States. The National Health and Nutrition Examination Survey (NHANES) is a government survey run every several years recording a number of vital statistics on a random sample of Americans. A body mass index (BMI) is computed for each individual in the sample based on the individual's height and weight. Here are sample results for 8-year-old boys over the past 40 years. The table gives the sample size for 3 different surveys, the sample mean and sample standard deviation. Suppose we want to run an ANOVA to see if there is a difference in mean BMI for the three surveys. Assume each survey is a random sample and there are no extreme outliers.
What is the sample standard deviations for each survey?
...the NHANES II study?
...the NHANES study?
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