CONCLUSION

Your conclusion statement should, as the name implies, bring your paper to a proper conclusion.  It should compare the actual results of your experiment to what you expected to happen before beginning (your hypothesis).  It should also analyze experimental error and state how, if you had a chance to do the experiment again, you would improve on what you did.

Sample conclusion statement:

The hypothesis of this experiment was supported.  The temperature changed faster during the first 5 minutes when the crushed ice was added to the water versus the cubed ice.  During the 15 trials, the water temperature decreased from 8⁰C to 4⁰C in 5 minutes with the crushed ice, and from 8⁰C to 6⁰C in 5 minutes with the cubed ice.  The temperature decreased faster with the crushed ice because more surfaces of the crushed ice were in contact with the water than the surfaces of the cubed ice. 

This experiment can be improved by using a digital thermometer  to record the temperature and by conducting 15 additional trials for each size of ice cube. If I were to conduct another experiment, I would use 3 different sizes of crushed ice and 3 different sizes of cubed ice.