The "Dayton Water Survey" was an example of an unobtrusive measure.

Name: The "Dayton Water Survey" was an example of an unobtrusive measure.
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The Dayton Water Survey was a study that utilized unobtrusive measures, meaning methods of data collection that do not disturb the subjects or their environment. In this case, researchers analyzed the amount of soap scum in the water pipes to determine the level of water hardness, which was an indicator of residents' water usage habits.

The "Dayton Water Survey" Was an Example of an Unobtrusive