Stratified Sampling Flashcards

A sampling method where the population is divided into groups (strata) and a proportional sample is taken from each group.

Subgroups within a population that share a common characteristic, such as age, gender, or income.

To ensure that the sample accurately represents the population by including all key subgroups.

The process of selecting a sample size from each stratum in proportion to its size in the population.

(Size of stratum ÷ Total population size) × Total sample size.

It provides a more representative sample and reduces bias compared to simple random sampling.

It can be time-consuming and requires detailed knowledge of the population to divide it into strata.

In a school, year groups (e.g., Year 7, Year 8) can be considered as strata.

1. Divide the population into strata. 2. Calculate the proportion of each stratum. 3. Select a proportional sample from each stratum.

When the population has distinct subgroups that need to be represented in the sample.