This structured one direct inquiry is the most commonly used method of data collection. Most of the questions designed are fixed-choice, or closed-ended, and respondents simply choose one (or more) of several possible answers given in advance. The sample for a survey is drawn from the whole population according to a certain sampling method. In order to make inferences about the population from the information in the sample, random sampling is generally used.
2, tune sampling questionnaire method has the following advantages:
Firstly, the questionnaire is easy to operate;
Secondly, the data collected are more reliable, because the questions are closed-ended (with a fixed choice of answers), which greatly reduces the variation that may be caused by differences in the investigator;
Lastly, the coding, analysis and interpretation of the data is simpler because the sample is representative and allows for more reasonable judgments to be made about the overall situation.
3. The disadvantages of the sampling method are:
First, respondents may be unwilling or unable to provide the information required. For example, in the case of questions about attitudes or motivation, sometimes respondents may not be very aware of the factors that determine their motivation (e.g., choosing a certain commodity, making a certain decision). The information provided may therefore be inaccurate. Respondents may also be reluctant to answer questions that are personal or sensitive.
Secondly, closed questions limit the range of answers respondents can choose from, potentially jeopardizing the validity of certain types of data, such as data on beliefs and feelings.
Finally, the wording of the questions is also difficult, and the difficulty of designing a good questionnaire is greater. Nonetheless, sample questionnaires remain the most common method of collecting primary data. In China, a wide variety of public opinion polls and market surveys are basically questionnaires.