Use the following information for parts (a) – (c): The 2 x 2 table below displays the results of a cross-sectional study that investigated the effectiveness of bicycle safety helmets in preventing head injury. The data consist of a random sample of 790 individuals who were involved in bicycle accidents during a specified one year period. i. Calculate the 95% confidence interval for the risk difference ii. Interpret the 95% confidence interval for the risk difference

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
Section9.2: Probability
Problem 3E: The conditional probability of E given that F occur is P(EF)= _____________. So in rolling a die the...
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Use the following information for parts (a) – (c): The 2 x 2 table below displays the results of a cross-sectional study that investigated the effectiveness of bicycle safety helmets in preventing head injury. The data consist of a random sample of 790 individuals who were involved in bicycle accidents during a specified one year period. i. Calculate the 95% confidence interval for the risk difference ii. Interpret the 95% confidence interval for the risk difference
Head Injury Totals
Yes No
Wearing Helmet Yes 19 127 146
No 213
431 644
232 558 790
Totals
Let D = event that a subject has a head injury and E =
event that subject was wearing a helmet.
Transcribed Image Text:Head Injury Totals Yes No Wearing Helmet Yes 19 127 146 No 213 431 644 232 558 790 Totals Let D = event that a subject has a head injury and E = event that subject was wearing a helmet.
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