A representative, national survey of 1,500 Americans was conducted by telephone for this study. The interviews were conducted from November 3 to 12, 1999. Each interview lasted about 15 minutes, and was devoted exclusively to this issue. A follow-up telephone interview of a subset of initial respondents was conducted in mid December.
An RDD (Random-Digit-Dial) sampling methodology was utilized to ensure that the results are projectable to the American public as a whole. Sampling error for a sample this size is ± 2.6% at the 95% confidence interval.
Many steps were taken during the course of the survey to ensure this study is as representative as possible, including: