Each student in a science class of 25 conducts the same experiment. One student gathers all the data from her classmates and summarizes the results of the experiment for the class. She compares the data she personally recorded with the class data. Which of these might indicate to her that her results are valid?

1.Three other classes performed the same experiment.
2.The same experiment was repeated two years in a row.
3.Many other students recorded data similar to hers.
4.Another student in her class reached a different conclusion.