a. With the group w/o helmets, calculate the 95% confidence interval with head injuries b. With the ones wearing helmets, calculate the 95% confidence interval with head injuries
a. With the group w/o helmets, calculate the 95% confidence interval with head injuries b. With the ones wearing helmets, calculate the 95% confidence interval with head injuries
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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a. With the group w/o helmets, calculate the 95% confidence interval with head injuries
b. With the ones wearing helmets, calculate the 95% confidence interval with head injuries

Transcribed Image Text:A study was conducted to investigate the effectiveness of bicycle safety helmets in
preventing head injury. The data consist of a random sample of 793 persons who were
involved in bicycle accidents during a one-year period (Table E4.12).
TABLE E4.12
Wearing helmet
Head injury
Yes
No
Total
Yes
17
218
235
No
130
428
558
Total
147
646
793
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