A sample of fish is taken from a lake to measure the effect of pollution from a nearby factory on the fish.
A) Observational study
B) Experiment

Question

Quizplus · Accepted Answer

In an observational study, researchers observe and measure outcomes without manipulating any variables. In this case, the researchers are observing the fish to assess the impact of pollution, without altering any conditions.

A Sample of Fish Is Taken from a Lake to Measure