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Practical Data Analysis with JMP® by Robert Carver

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Extent of Sampling Variation

All samples vary, and the relevant variation is slightly different depending on whether we're looking at quantitative continuous data or qualitative ordinal or nominal data. In this section we'll look more closely at how we can gauge and characterize the sampling distribution of the sample proportion for qualitative, categorical data and the sampling distribution of the sample mean for continuous data.

Sampling Distribution of the Sample Proportion

In the expanded NHANES data table the last column categorizes respondents' households by level of food security, referring to the reliability of adequate nutrition in the household. In this sample of 10,348 respondents, we find that 19.1% of households are classified ...

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