Between 2010 and 2015,1000 of 10,000 young women age 17 to 20 years at a university tested positive for a sexually transmitted infection (STI).Of the 1000 diagnosed STIs,300 were gonorrhea and 500 were chlamydia.Which of the following statements best summarizes these findings?

Question

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A proportion is a ratio in which the denominator includes the numerator.If the proportion is small,we can express the number per 1000.The answer of 100:1000 correctly summarizes that 1000 of 10,000 (or 100:1000)young women had the problem.The answer of 300:1300 adds the total of the numerator to the denominator,which is unnecessary because the gonorrhea cases were already included in the denominator.In the answer of 300:500,the ratio comparing gonorrhea to chlamydia does not meet the epidemiological definition of proportion (i.e.,the denominator must contain the numerator).Although proportions may be expressed as percentages,in the answer of 50% the percentage reflects the number of gonorrhea cases to all STIs,which doesn't summarize the total STI problem.

Between 2010 and 2015,1000 of 10,000 Young Women Age 17