Homework3 - BME 423 Fall 2011 HOMEWORK#3 Due before class...

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Page 1 of 4 BME 423 Fall 2011 HOMEWORK #3 Due before class Wednesday November 9 th , 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. Confidence Interval (20 points) a. In Homework #1 problem 1 you were asked to estimate the population mean and standard deviation of BME 423 students’ heart rates based on a random sample of 12 students. The sample had a mean heart rate of 70.3 beats/min, and a standard deviation of 16.8 beats/min. What is the 95% confidence interval (CI) for the population mean? b. In Homework #2 problem 2, you were asked to use z-test to find whether there was a difference between the proportion of successful outcomes (no back pain) in patients undergoing surgical treatment and the proportion of successful outcomes in patients undergoing conservative treatment. Treatments No back pain (patient) Pack pain (patient) Surgical 35 21 Conservative 15 34 i. What is the 95% confidence interval for the difference in the proportion of successful outcomes in patients undergoing surgical treatment and those undergoing conservative treatment. ii. What is the 99% confidence interval for the difference in the proportion of successful outcomes in patients undergoing surgical treatment and those undergoing conservative treatment.
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