to be able to compare results to increase the validity of the data to form the best conclusion to ensure the procedure is followed
I gave my students this multiple choice question: Why is it important to have a large sample size in an investigation?

Only one answer is correct among these 4 choices:
- to be able to compare results
- to increase the validity of the data
- to form the best conclusion
- to ensure the procedure is followed

Could you tell me which one is correct?

to increase the validity of the data