Garry's explanation is a good one. The data for this survey was collected via surveywalls (example at [1]), which let visitors access premium content online for free in exchange for answering a few questions.
All respondents here have US IP addresses and self-report age in the 13-25yr range. We generally see honesty rates of 90% or higher to questions for which we can verify the answer (e.g. "Which OS are you currently using?" or "Who is the President of the US?").
Garry's explanation is a good one. The data for this survey was collected via surveywalls (example at [1]), which let visitors access premium content online for free in exchange for answering a few questions. All respondents here have US IP addresses and self-report age in the 13-25yr range. We generally see honesty rates of 90% or higher to questions for which we can verify the answer (e.g. "Which OS are you currently using?" or "Who is the President of the US?").
1. Example surveywall: http://www.hyperink.com/So-You-Want-To-Be-A-Programmer-b1559...)