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

Qualitative data

Explanation:

Since we are informed that the scientist writes down that there was an iridescent sheen on the surface of the water, this is a qualitative data.

Qualitative data is a firm of data that one can observe and then record. It should also be noted that it is non numerical. It can be gotten from observations, conducting focus groups, having a one-to-one interviews, etc.

this is qualitative and categorical (binary) data

Explanation:

There are no measurements. The observation is qualitative: observation of some change in appearance. It is categorical in that the possible values are only ‘no sheen’ or ’sheen’.

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