Homework2

Homework2 - BME 423 Fall 2011 HOMEWORK #2 Due before class...

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Page 1 of 3 BME 423 Fall 2011 HOMEWORK #2 Due before class Wednesday October 12, 2011 Please read the homework guidelines before starting your assignment. Tables necessary for completing this homework can be found in your textbook and are posted on Blackboard. 1. Hypothesis testing (30 points) On the last homework, we have concluded that there is a difference in reduction of bulging disc size for the four groups using Analysis of Variance (ANOVA). We now go further to isolate the differences between groups . The problem is shown below: Lower back pain is the most common cause of job-related disability, a leading contributor to missed work and the second most common neurological ailment (after headache). One main source of the pain is herniated disc, where the soft, central portion of an intervertebral disc bulges out and pinches the nerves. A study was conducted to investigate different treatments on reducing the bulging size X of the herniated disc. The results are following: Group n mean of X (mm) standard deviation (mm) No treatment 10 + 0.5 0.8 Acupuncture 10 - 0.5 0.7 Physical Therapy 10 - 0.3 1.2 Ultrasound Therapy 10 -0.4 0.2 a. Basic t Test: What are the rules of thumb when using t test? Perform pair-wise comparison for all six possible pairs with P<0.05 for each pair to determine whether there are significant differences between bulging size reduction for each of the pairs. By
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This note was uploaded on 01/20/2012 for the course BME 423 at USC.

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Homework2 - BME 423 Fall 2011 HOMEWORK #2 Due before class...

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