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WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
8th Edition
ISBN: 9780357452905
Author: Rosner
Publisher: Cengage Learning US
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Textbook Question
Chapter 3, Problem 113P
Infectious Disease, Cardiovascular Disease
A validation study is to be performed in a local hospital to check the accuracy of assessment of hospital-acquired infection (INF) following coronary bypass surgery (coronary-artery bypass graft, or CABG). In a given year the hospital performs 1100 CABG procedures. A Centers for Disease Control and Prevention (CDC) algorithm is currently used to categorize subjects as having INF. To validate this algorithm, all CDC+ subjects (N = 100) and a random sample of CDC− subjects (N = 1000) will be ascertained by an infectious-disease (ID) fellow and a detailed investigation will be performed, including a chart review and documentation of antibiotic use. Assume the ID-fellow’s determination is correct.
Suppose 100 CDC+ subjects are ascertained, of whom the ID fellow confirms 80. Because there are a large number of CDC− subjects (1000), only a sample of 100 is studied, of whom the ID fellow confirms 90.
What is the sensitivity of the CDC algorithm?
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SWIMMER’S FLEXIBILITY STUDY Swimming requires complete body movement as defined in sports science. A swimmer’s flexibility helps in his/her movement in water, thus making him/her a faster swimmer. In a study conducted to determine if there is an improvement in swim speed after doing flexibility exercise, 15 swimmers of the same characteristics were randomly selected. They were asked to do a 25-m freestyle and their swim speed (in seconds) were recorded. After this, a flexibility exercise was done. All the swimmers were then asked to do another 25-m freestyle and their swim speed (in seconds) were also recorded. The data collected are given below and can also be found in the worksheet “swim_speed”of excel file “exer3_data.xlsx”. R outputs can be found in the file “exer3_outputs.pdf”.(Use before – after in your computations
Swimmer
1
2
3
4
5
6
7
8
Before
16.87
19.42
20.04
22.82
24.24
17.76
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17.17
After
15.82
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23.88
18.12
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16.03
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10
11
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Chapter 3 Solutions
WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
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