---
title: "About the Survey"
description: "Results for this survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates International among a nationwide sample of 1,503 adults, 18 years of age or older, from July 23-27, 2008. The following table shows the error attributable to sampling that would be expected at the 95% level of confidence […]"
date: "2008-07-31"
authors:
  - name: "Seth Rubenstein"
url: "https://www.pewresearch.org/politics/2008/07/31/about-the-survey-401/"
categories:
  - "Economic Conditions"
  - "Economic Policy"
---

# About the Survey

Results for this survey are based on telephone interviews conducted under the direction of Princeton Survey Research Associates International among a nationwide sample of 1,503 adults, 18 years of age or older, from July 23-27, 2008. The following table shows the error attributable to sampling that would be expected at the 95% level of confidence for different groups in the survey:

![Table](https://assets.pewresearch.org/wp-content/uploads/sites/5/legacy/438-28.gif)

In addition to sampling error, one should bear in mind that question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of opinion polls.