Fundamentals of Biostatistics
8th Edition
ISBN: 9781305268920
Author: Bernard Rosner
Publisher: Cengage Learning
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Chapter 6, Problem 24P
A study of psychological and physiological health in a cohort of dialysis patients with end-stage renal disease was conducted [7]. Psychological and physiological parameters were initially determined at baseline in 102 patients; these parameters were determined again in 69 of the 102 patients at an 18-month follow-up visit. The data in Table 6.12 were reported.
Table 6.12 Psychological and physiological parameters in patients with end-stage renal disease
Do you have any opinion on the physiological and psychological changes in this group of patients? Explain.(Note: A lower score on the PAIS scale indicates worse adjustment to illness.)
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Mercury Levels in Fish
Figure 4.25 shows a scatterplot of the acidity (pH) for a sample of n = 53 Florida lakes vs the average mercury level (ppm) found in fish taken from each lake. The full dataset is introduced in Data 2.4 and is available in FloridaLakes. There appears to be a negative trend in the scatterplot, and we wish to test whether there is significant evidence of a negative association between pH and mercury levels.
Figure 4.25 Water pH vs mercury levels of fish in Florida lakes
(a)
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b)
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(c)
Is this convincing evidence that low pH causes the average mercury level in fish to increase? Why or why not?
Chapter 6 Solutions
Fundamentals of Biostatistics
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