A stratified random sample can be obtained by first partitioning a population into disjoint groups (or strata)
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A stratified random sample can be obtained by first partitioning a population into disjoint groups (or strata) and then taking random samples from each of the strata. For instance, a stratified random sample can be obtained by first partitioning all the undergraduate students at a university by their class (freshman, sophomore, junior, and senior) and then taking a random sample from each of these strata.
a. Can you think of a situation where a stratified sample may improve on obtaining a representative sample as compared to drawing a simple random sample? Explain.
b. Describe a population and a stratified sample of the population.
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