Thoughtful research stays true to the data; assertions about differences in survey results need to be supported by tests of statistical significance. To advance that aim, we offer this margin-of-error calculator – our MoE Machine – as a convenient tool for data producers and consumers alike.
The tools below allow for calculation of the margin of sampling error in any result in a single sample; the difference needed for responses to a single question to be statistically significant (e.g., preference between two candidates, approve/disapprove or support/oppose); and the difference needed for statistical significance when comparing results from two separate samples. [cont.]
Langer Research Associates