Description
A general approach for finding a margin of error involves using the standard deviation of a sample proportion. With appropriate sample sizes, 95% of all sample proportions are within about two standard deviations of the true population proportion. Therefore, due to natural sampling variability, 95% of all samples have a sample proportion of true proportion ± 2 ⋅ sample standard deviation, where 2SD is the margin of error.
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From EngageNY.org of the New York State Education Department. Algebra II Module 4, Topic C, Lesson 17.
Available from engageny.org/resource/algebra-ii-module-4-topic-c-lesson-17; accessed 2015-05-29.
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