Check for errors and run the experiment again. Change the hypothesis to match the conclusion. Change the variable so the data will match the hypothesis. Ignore the data and prepare the science fair display anyway.
I gave my students this multiple choice question: When performing an experiment for a science fair, what should be done if the data do not support the hypothesis?

Only one answer is correct among these 4 choices:
- Check for errors and run the experiment again.
- Change the hypothesis to match the conclusion.
- Change the variable so the data will match the hypothesis.
- Ignore the data and prepare the science fair display anyway.

Could you tell me which one is correct?

Check for errors and run the experiment again.