Hello! Socratic's Terms of Service and Privacy Policy have been updated, which will be automatically effective on October 6, 2018. Please contact hello@socratic.com with any questions.

Is there a formula for stratified sampling?

1 Answer
Mar 2, 2016


Yes, there is a formula for stratified sampling.


The formula for stratified sampling is as follows:
#("group size")/("population size") times "sample size"#

The formula is used to find the amount of people that exhibit a certain trait within a population.

For example, in a class of 40 students, in which 15 are male, and 25 are female, find the number of male students which, out of a sample of 5, got the highest grades.

#(15)/(40) times 5 = 1.875#, which, when rounded to 1 d.p gives 2.