Homework_3_Solutions

# Homework_3_Solutions - Homework 3 Solutions 6.11 a...

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Homework 3 Solutions 6.11 a. Percentage ever bullied = (42/92) × 100% = 45.65% among short students b. Percentage ever bullied = (30/117) × 100% = 25.64% among students not short c. Yes, there is a relationship. Short students are more likely to have been bullied than students who are not short. 6.23 a. For short students, risk = 42/92 = .4565, or 45.65%. For “not short” students, risk = 30/117 = .2564, or 25.64%. b. Relative risk = 78 . 1 64 . 25 65 . 45 category short" not " in Risk category short" " in Risk = = . Short students are 1.78 times as likely to be bullied as are students who are not short. c. Percent increase in risk = (Relative risk 1) × 100% = (1.78 1) × 100% = 78%. Equivalently, % 78 % 100 64 . 25 64 . 25 65 . 45 % 100 risk Baseline risks in Difference = × = × Being short increases the risk of being bullied by 78%. d. Odds ratio = 346 . 2 3448 . 8077 . 87

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Homework_3_Solutions - Homework 3 Solutions 6.11 a...

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