PTA Question of the Week - Normal distribution

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You are reviewing a research study that examined elbow extension range of motion two weeks following arthroscopic surgery. Assuming a normal distribution, what percentage of patients participating in the study would you expect to achieve a goniometric measurement value between the mean and one standard deviation above the mean?

1. 28 percent
2. 34 percent
3. 44 percent
4. 68 percent

The solution will be posted in a few days

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