Science Fair: More on Hypotheses

Let's use the cell phone radiation experiment to help hone the null and alternative hypotheses.  P. And M. are using an inexpensive cell phone EMF meter to measure cell phone radiation.  Their null hypothesis for this experiment is "All cell phones emit the same amount of radiation." Their alternative hypothesis is "Apple cell phone or iPhones emit more radiation than Android cell phones."

Their alternative hypothesis could just as well have been that Android devices emit more radiation than Apple phones.  What happens if all of the cell phones do emit the same amount of data, is their experiment a failure?  No!  Their results may support either the null hypothesis or the alternative hypothesis.  The data may in fact, refute both!  The important thing is to have an idea to test which becomes the hypothesis!