In survey studies of research, which is of more importance in influencing perception studies as it relates to the respondents. Is it academic qualification or income level of respondents? Which of the variables do you think is of a more impact?
Whose academic qualification do you refer to here? Is it the researcher??
Anyhow, it's usually a case by case condition. But if you're doing a survey, you can always limit the error comes from biases like that by using understandable language for the sample. If not everyone can understand your survey well, not everyone will be able to answer accordingly, and in return, your data would be less accurate as well.