August 22, 2010 By Janice VanCleave. A conclusion is a summary of the experiment. For a cause-effect experiment, the conclusion should state the hypothesis and and tell whether the results of the experiment supported the hypothesis. If the results did not support your hypothesis, say so, and then add information about why this happened. For Example: If the cause-effect experiment has the following problem, hypothesis,data, and results, the conclusion might be stated as shown below: