In the experimental evaluation of a new drug, what is the purpose of a placebo?

Questions:

1.- Please read the article: How to Prevent High Blood Pressures, and develop an experiment to detect hypertension in your community.

2.- During an experiment, what is the purpose of a control group and the experimental group?

3.- In the experimental evaluation of a new drug, what is the purpose of a placebo?

4.- Please explain the Scientific Method Steps.