Students in a different science class carried out the same experiment. The data they obtained did not support the hypothesis that increased exercise results in increased heart rate. The most scientifically sound way to deal with this situation is to
(1) write a new hypothesis
(2) read about pulse rate in a biology textbook
(3) have the students in both classes vote to decide which hypothesis is correct
(4) ask students in a third class to do the experiment and see if their results support the hypothesis