Elementary Statistics
12th Edition
ISBN: 9780321836960
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 11, Problem 4RE
To determine
To test: Whether there is sufficient evidence to reject the claim that wearing a helmet has no effect on whether facial injuries are received or not.
To check: Whether a helmet seems to be effective in helping to prevent facial injuries in a crash or not.
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A case−control study was performed among 145 subjects with macular degeneration and 34 controls, all of whom were 70- to 79-year-old women. A genetic risk score was developed to help differentiate the cases from the controls. The risk score was categorized into six groups (1, 2, 3, 4, 5, 6), with 6 being the highest risk and 1 being the lowest risk.The data in Table 10.48 were obtained relating the risk score to case/control status.
taBlE 10.48
risk score
cases
controls
1
3
11
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7
3
3
6
6
4
10
8
5
11
2
6
108
4
total
145
34
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Chapter 11 Solutions
Elementary Statistics
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