Fundamentals of Biostatistics
8th Edition
ISBN: 9781305268920
Author: Bernard Rosner
Publisher: Cengage Learning
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Chapter 8, Problem 91P
A study compared mean electroretinogram (ERG) amplitude of patients with different genetic types of retinitis pigmentosa (RP), a genetic eye disease that often results in blindness. The results shown in Table 8.24 were obtained for ln (ERG amplitude) among patients 18–29 years of age.
Table 8.24 Comparison of mean ln (ERG amplitude) by genetic type among patients with RP
Implement the test in Problem 8.90, and report a p- value (two-tailed).
8.90 What test can be used to compare the variance of ln (ERG amplitude) between patients with dominant vs. recessive RP?
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Denny studied factors affecting cardiovascular reactivity to a postural change in a sample of healthy men and women. Change in systolic blood pressure (SBP) from supine to standing position was used as the measure of cardiac reactivity in a sample of 842 adults. Supine measurement of blood pressure was taken after participants had lain on an examination table for 15 minutes. Blood pressure was determined every 30 seconds using a Dinamap device for 2 minutes, and the measurements were averaged. Participants then stood up immediately, and additional measurements were made for another 2 minutes. Below is a table describing the characteristics of Denny’s sample:
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Chapter 8 Solutions
Fundamentals of Biostatistics
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