erf() - The Gauss error function

[Kernelpanic]

As I understand it, Gaussian-Error function is a way to determine the degree of error in something. For example: opinion polls.
1500 people are asked which party they want to vote for or intend to vote for. The result can never be 100% (safety). The question here is always: How high is the error quotient?
The Gaussian-Error function should provide a reliable answer here - or I misunderstood the whole thing.