Seat belts help prevent injuries in automobile accidents, but they certainly dont offer complete protection in extreme
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Seat belts help prevent injuries in automobile accidents, but they certainly don’t offer complete protection in extreme situations. A random sample of 319 front-seat occupants involved in head-on collisions in a certain region resulted in 95 people who sustained no injuries (“Influencing Factors on the Injury Severity of Restrained Front Seat Occupants in Car-to-Car Head-on Collisions,” Accident Analysis and Prevention [1995]: 143–150). Does this suggest that the true (population) proportion of uninjured occupants exceeds .25? State and test the relevant hypotheses using a significance level of .05.
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Related Book For 
Introduction To Statistics And Data Analysis
ISBN: 9780495118732
3rd Edition
Authors: Roxy Peck, Chris Olsen, Jay L. Devore
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