Randomization is a procedure used for assignment or allocation of subjects to treatment and control groups in experimental studies. Randomization increases the likelihood that: (Choose the one best answer):

• A) Treatment and control groups are similar except for the presence of treatment
• B) The results of the trial may be generalizable to the larger population
• C) The study is more likely to show significant results
• D) Participants are more likely to stay in the study
• E) None of the above

An epidemiologist is interested in the rate of gonorrhea in a population of 2000 college students who are known to be at risk for this disease. The epidemiologist chose to follow the students for a total of 3 years. A total of 1250 students were followed for the entire 3-year period and among these students there were 90 cases of gonorrhea. 525 students were followed for 2 years and among these there were 30 cases of gonorrhea. 225 students were followed for only 6 months and among these there were 10 cases of gonorrhea. What is the incidence density rate of gonorrhea per 1,000 person years from this study? Please round your answer to the 10^th decimal place.

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