A sample is a set of observations from the population. The sampling method is the process used to pull samples from the population. Simple random samples and stratified random samples are both ...

However, statistical methods allow for inferences about a population by analyzing the results of a smaller sample extracted from that population. Stratified random sampling is one way of doing this.

In economics studies, this might entail comparing the average ages or income levels of the sample with the known characteristics of the population at large. A stratified random sample is a ...

Stratified Random Sampling – If you suspect ... The larger the sample size, the more precise the results will be. With a ...

The example in the section "Stratified Sampling" assumes that the sample of students was selected using a stratified simple random sampling design. This example shows analysis based on a more complex ...

We abstracted data from the labor and delivery records of a stratified random sample of live births and of all cases in which the newborn had early-onset group B streptococcal disease (i.e ...

We collected school start dates for the 2023-24 school year from a nationally representative, stratified random sample of 1,573 districts. To create this dataset, we began with a stratified random ...