Public opinion is measured through scientific polling, and the results of public opinion polls influence public policies and institutions.
Margin of error
A confidence interval stating that the sampled value is very likely to be within a certain range of the actual population's value
The notion that any person surveyed is as likely to be chosen as any other person in the polling universe
The idea that a sample reflecting characteristics of a population; usually more than 1000 respondents
A method of gathering public opinion using random sampling and surveys of people