LOS ANGELES -- The zeros kept piling up, the pressure kept building, and then, with the bases loaded and two outs in Thursday's 11th inning, Orion Kerkering, the Philadelphia Phillies' young reliever, ...

Presidential job approval ratings are one of the few metrics consistently and similarly measured in nearly all major public polls. An average of recent polls can often paint a more reliable picture of ...

The nuts and bolts of our public opinion surveys. A summary of ABC News' polling standards and survey methodology follows. ABC News maintains standards for disclosure, validity, reliability and ...

Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is most often used by researchers to test predictions, called hypotheses. The first step in ...