the cover letter is very informal, yet informative and contains the most important parts of a cover letter. in the question about age, your age intervals overlap. other than that, this was a great attempt to create an internet survey!
the questionnaire is very interesting and the questions are good.
the questionnaire looks perfect, i enjoyed answering your questions. moreover, it was nearly all multiple choice questions, which i love. i think you did a great job!
actual and interesting, i think everyone between the ages of 16 and 25 will give similar answers.