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The interviews were conducted by professional interviewers at the SRC from our special facilities in Walker Plaza on the Indiana University-Purdue University Indianapolis campus. All interviewers received at least nine hours of general interviewer training, in addition to the more than one hour of specific training on the youth gaming questionnaire. Most of the interviewers were “veteran” interviewers in the sense that they had participated in similar research projects previously. Some have been interviewers for the Survey Research Center for over five years.

The maximum margin of error for the survey does not exceed 3.4% at a 95% confidence interval. Of course, additional error may result from things such as question wording, respondents’ inattention, pace of speech by the interviewer, and respondents’ willingness to honestly answer individual items. Each of these is given special attention during the questionnaire design and data collection phases so total survey error is minimized as much as possible. We have no reason to believe there are major biases in the data collected for this research.

Each interviewer was given a set of answers entitled “What the Respondent Might Like to Know” which were to provide standard responses to questions raised by the people contacted for an interview. The sample of telephone numbers was obtained from Survey Sampling, Incorporated. In addition all calls were monitored and 10% of all completed interviews were verified by supervisors. All “non-contacts” such as answering machines or no answers were reattempted at least 10 times.