Things that can be changed are called variables. Change something that will help you answer your questions. The procedure must tell how you will change this one thing. The procedure must explain how you will measure the amount of change. As you do experiments, record all numerical measurements made.
Data can be amounts of chemicals used, how long something is, the time something took,etc.
If you are not making any measurements, you probably are not doing an experimental science project. Produce Graphs and Charts Studying tables and graphs, we can see trends that tell us how different variables cause our observations. Based on these trends, we can draw conclusions about the system under study. These conclusions help us confirm or deny our original hypothesis. Draw a Conclusion Using the trends in your experimental data and your experimental observations, try to answer your original questions.