Doctors are interested in seeing if lifting weights to alleviate back pain is ef

Question

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 mean

B) comparing proportions from 2 independent samples

C) comparing means from dependent samples

D) comparing proportions from dependent samples

E) one proportion

F) comparing means from 2 independent samples

Explanation / Answer

As they rate pain from 1-10, and we get the mean for the two groups, and the two groups contain the same individuals, the data are dependent (paired), so

OPTION C) comparing means from dependent samples [ANSWER, C]

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