The question about a good research question, is a really good question! The ability to point the questions towards a definitive goal is needed, so long as the information is not too restrictive.

Choice of qualitative, quantitative and mixed for research paradigms gives an assortment of opportunities to gather the best information.

Pure quantitative research relies on the collection of quantitative data (i.e., numerical data) and follows the other characteristics of the quantitative research paradigm shown in Table 2.1. Pure qualitative research relies on the collection of qualitative data (i.e., nonnumerical data such as words and pictures) and follows the other characteristics of the qualitative research paradigm shown in Table 2.1.Mixed research involves the mixing of quantitative and qualitative research methods, approaches, or there paradigm characteristics. The exact mixture that is considered appropriate will depend on the research questions and the situational and practical issues facing a researcher (Johnson, R.B. & Christensen, L. (2014)).

From the information provided through the quote, notes the three research paradigms where they are given clear division to data collection. I believe research starts by first noting your goal, then understanding the process to get to this goal. Should your main interest be in gathering data that is all based on opinion or ideas of others, then qualitative is the research model.

Reference

Johnson, R.B. & Christensen, L. (2014b) Chapter 2: Quantitative, qualitative and mixed research. In Educational research: quantitative, qualitative and mixed approaches, (pp29-58) Thousand Oaks, CA: Sage. Retrieved from https://moodle.royalroads.ca/moodle/pluginfile.php/602235/mod_book/chapter/173842/Johnson%2C%20R.B.%20%20Christensen%2C%20L.%20%282014%29.%20Chapter%202.pdf