Doctors are interested in seeing if lifting weights to alleviate back pain is effective. twenty five volunteers are asked to rank their level of pain on a scale from one to ten. for the next two months, they then exercise for 2 months with a physical therapist. the volunteers focus on different weight lifting exercises that strengthen the back. twenty five volunteers are again asked to rank their level of pain on a scale from one to ten. was the amount of pain less after completing the exercises? what type of test would they conduct to test this claim? a) one meanb) comparing proportions from 2 independent samplesc) comparing means from dependent samplesd) comparing proportions from dependent samplese) one proportionf) comparing means from 2 independent samples