Myopia (IE

question 9

Multiple Choice

Myopia (i.e. ,nearsightedness) is a result of environmental and genetic factors.In Singapore,the percent of military personnel having myopia increased dramatically over a 20-year period.Based on this fact,researchers wondered if the effect of the environment might be stronger and the genetic effect much less pronounced than previously thought.To study this issue,data from a random sample of 429 men,ages nineteen to twenty-five,in the Singapore military were obtained.Among other things,the men in the study were classified as to whether or not they had myopia and whether at least one of their parents had myopia.The results are presented in the table below. Let x be the indicator variable We wish to fit a logistic regression model, ,where p is the binomial probability that a man in the Singapore military has myopia and log is the natural logarithm. What is the odds ratio?

• A)0.57
• B)1.75
• C)5.53
• D)9.70

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