Question

a group of scientists wants to know if a new fertilizer makes plants grow taller. they randomly assign half the plants to receive the new fertilizer and the other half to receive none, then measure the growth. what type of data collection method is this? a) survey b) observational study c) experiment d) simulation

Explanation:

In an experiment, researchers manipulate a variable (here, giving new fertilizer or none) and observe the effect (plant growth). They randomly assign treatments, which is a key characteristic of an experiment. A survey involves asking questions, an observational study just observes without manipulation, and a simulation models a situation rather than conducting a real - world test.

Answer:

C. Experiment