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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 ztest 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.
iii. Based on the above, is the difference in the proportion of successful outcomes
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 '06
 D'Argenio

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