To ensure all Maryland citizens are represented, the Goucher Poll is conducted using random digit dialing (RDD) of a stratified random sample using landline and cellular telephone numbers. The sample of telephone numbers for the survey is obtained from Survey Sampling International, LLC (http://www.surveysampling.com/).
The most recent survey was conducted Sunday, March 3, to Thursday, March 7. During this time, interviews were conducted from 1 to 6 p.m. on Sunday and from 5 to 9 p.m. on Monday through Thursday. The Goucher Poll uses Voxco Computer Assisted Telephone Interviewing (CATI) software to administer its surveys. Interviews are conducted by a staff of professionally trained, paid student interviewers.
Interviewers attempted to reach respondents with working phone numbers a maximum of five times. Only Maryland adults-residents aged 18 years or older-were eligible to participate. Interviews were not conducted with adults who were reached at business or work numbers. For each landline number reached, one adult from that household was selected on the basis of being the oldest or youngest adult in that residence. Thirty-five percent of the interviews were conducted on a cell phone, and 65 percent were conducted on a landline.
Interviews for this survey were completed with 791 Maryland citizens. For a sample size of 791 there is a 95 percent probability that the survey results have a plus or minus 3.48 percent margin of error from the actual population distribution for any given survey question. Margin of errors are higher for subsamples.