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Created page with "'''Stratified random sampling''' is a form of random sampling that involves dividing the population into strata then taking a sample from the strata...."
'''Stratified random sampling''' is a form of [[Simple random sample|random sampling]] that involves dividing the population into strata then taking a sample from the strata. Note that this method is ''only'' valid for observational studies and ''cannot'' be used for experimental studies.
==Example==
A researcher wants to know if the amount of time that college students spend reading the Bible is associated with gender. How might he procure a sample of 500 subjects, with even amounts in each group, in order to gather data?
Stratify the population into males and females, then number the strata 00001-XXXXX.<ref name=note>Here, XXXXX refers to the total amount of students at this particular college. As this is an example, we could make up a total population number, but we won't because this is an example.</ref> Take a random sample from each strata, skipping repeat numbers and numbers over XXXXX,<ref name=note/> and ending once each group has hit 250.
==Notes==
{{reflist}}
[[Category:Probability and Statistics]]
==Example==
A researcher wants to know if the amount of time that college students spend reading the Bible is associated with gender. How might he procure a sample of 500 subjects, with even amounts in each group, in order to gather data?
Stratify the population into males and females, then number the strata 00001-XXXXX.<ref name=note>Here, XXXXX refers to the total amount of students at this particular college. As this is an example, we could make up a total population number, but we won't because this is an example.</ref> Take a random sample from each strata, skipping repeat numbers and numbers over XXXXX,<ref name=note/> and ending once each group has hit 250.
==Notes==
{{reflist}}
[[Category:Probability and Statistics]]