Choose the best answer for each situation. A scientist with the EPA examining water for contamination writes down that there was an iridescent sheen on the surface of the water. What type of data did the scientist record?

The scientist has written down and example of qualitative data. Since he specifically wrote down that there was an iridescent sheen on the surface of the water, he is writing down the quality of water as seen by him. The type or condition cannot be expressed numerically, which makes it a qualitative type of data.