to use up all the materials to give all the students the chance to participate to collect more data to fit the hypothesis to determine if the results are similar
I gave my students this multiple choice question: Why is it important to repeat an experiment several times?

Only one answer is correct among these 4 choices:
- to use up all the materials
- to give all the students the chance to participate
- to collect more data to fit the hypothesis
- to determine if the results are similar

Could you tell me which one is correct?

to determine if the results are similar