This depends on your specific research topic. If the research on the differences between different individuals is generally rigorous, it will be about 100. If you want to be lazy, 50 or 60 copies will do. There should be 90% valid samples. If the predicted effective sample rate is low, the number of questionnaires should be increased appropriately.
Brief introduction of questionnaire survey:
Questionnaire survey can be divided into paper questionnaire survey and network questionnaire survey according to different carriers. Paper questionnaire survey is a traditional questionnaire survey, and survey companies distribute these paper questionnaires by hiring workers to collect answers. This form of questionnaire has the disadvantages of troublesome analysis and statistics results and high cost.
Another kind of online questionnaire survey is that users rely on some online questionnaire websites, which provide a series of services such as designing questionnaires, distributing questionnaires and analyzing results.
The advantage of this method is that there is no geographical restriction and the cost is relatively low. The disadvantage is that the quality of the answer sheet cannot be guaranteed. At present, surveymonkey, a foreign survey website, provides this method, and there are questionnaire networks, quiz stars and survey schools in China.
Questionnaire survey can be divided into self-filled questionnaire survey and alternative questionnaire survey according to different respondents. Among them, the self-filled questionnaire survey can be divided into newspaper questionnaire survey, mail questionnaire survey and delivery questionnaire survey according to the different ways of questionnaire delivery; According to the different ways of talking with the respondents, the agent questionnaire survey can be divided into interview questionnaire survey and telephone questionnaire survey.