Question

drag the missing word into place
she will the experiment by comparing a group that was given real medication to a group that was not.
observe
analyze
control

Explanation:

In an experiment, "control" means to manage or regulate the experiment by having a group with the treatment (real medication) and a group without (the control group) to compare results. "Observe" is about watching, and "analyze" is about examining data, but here the action of setting up the comparison groups is "control".

Answer:

control