Please choose the correct answer to the question: A student recorded the growth rate of plants grown in the presence of two different types of music. Plants grown in the presence of one type of music grew faster than the other plants. Before reporting a conclusion, which should the student most likely do?

Answer1: use different plants Answer2: do the experiment again Answer3: add a third type of music Answer4: use fewer plants

Answer format: answer1/answer2/answer3/answer4