Once you've done your experiment and you've analyzed your data you need to sit back and think about all that's happened.
Fill out the attached blank pages (4-7) for
Discussion of Results and Writing Conclusions (at the end of the document). These will help you greatly in understanding how your experiment relates to what your question and hypothesis were.
To repeat the Science Buddies site: If the results of your science experiment did not support your hypothesis, don't change or manipulate your results to fit your original hypothesis, simply explain why things did not go as expected. Science is mostly all about ruling things out.
All information is important.