A tipe of qualitative data would be any occurrence of unusual odors, as this is not a result of any measurement (which would result in a quantitative data), but the appreciation of a quality of the studied object; in this case the quality itself is the odor of the water. The other options are types of quantitative data, since they are the result of different measurements.
Any occurrences of unusual odors is a type of qualitative data that Professor Tan should record during these studies. Thus, option (d) is correct.
What is qualitative data?
The term qualitative data refers to measures and collection of questionnaires, interviews, analysis, or observation. The qualitative data permits the research idea of an explanation of the subject.
Qualitative data involves a description of hypothesis with the use of concepts, types, and data analysis.
Professor Tan's studies of subject quality in streams near chemical plants. Professor Tan's requirement that any occurrences of unusual incidents be recorded as qualitative data during these studies.
Professor Tan finds the conclusion of the studies must be qualitative as a primary requirement. Primary and secondary research are part of the research method.
Therefore, option (b) is correct.
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