b) What is the probability of having seven successes? (2 points) c) What is the

Question

b) What is the probability of having seven successes? (2 points) c) What is the expected number of successful operations for the orthodontist? (3 points) d) What is the variance of the distribution? (4 points) 18.A group of homes in a community were sampled to look at the relationship between exposure to secondhand smoke and asthma in children. The following two-by-two table shows the number of children in the sample and their exposure and outcome. No Asthma Total Second-hand Smoke No second-hand smoke Total Asthma 402 56 458 153 250 403306 861 a. Calculate asthma incidence in the exposed and unexposed. (2 points) b. Calculate the relative risk for asthma due to exposure in this study. (4 points) c. Interpret the results in part b. (4 points) 19. Suppose 50 individuals received the flu vaccine last flu season. The probability that a person will die after receiving the flu vaccine is 0.028. (Hint: Binomial distribution) a) What is the probability that exactly four people will die after receiving the

Explanation / Answer

Sol:

Incidence rate is defined as the number of newly diagnosed cases of a disease divided by the number of people who are at risk.

Hence in the exposed the incidence would be ,

I = 402/555 = 0.724

In the unexposed the asthma incidence would be,

I = 56/306 = 0.183

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