General framework

A similar approach to that for estimating a population mean is used for estimating population proportions and other parameters.

Point estimate
A population parameter is usually estimated with the corresponding sample statistic.
Error distribution
The estimation error has a distribution.
Standard error and bias
A good estimator usually has an error distribution whose mean is zero (unbiased). The standard deviation of the error distribution is called the standard error.
From data:
We can usually find a numerical value for the standard error (or an approximation to it).
Confidence interval
A 95% confidence interval can be found from

estimate - 2 s.e.   to   estimate + 2 s.e.

(The interval can sometimes be improved by replacing 2 by another similar value. )