In the United States, 85% of the population has Rh positive blood. At a clinic o

Question

In the United States, 85% of the population has Rh positive blood. At a clinic one day, 16 people have blood samples taken. A researcher wonders if the sample of 16 patients might indicate that the portion of people in the community having Rh positive blood is different than the nation as a whole. She determines the expected value (mean) of people having Rh positiv blood in the sample is 8 persons. What is the estimated prevalence of Rh factor in the local community? Provide an answer as a fraction to the nearest 0.1, not a percentage (e.g., 0.2)

Explanation / Answer

Prevalence rate is calculated as follows;

Rate=(All new and pre-existing cases during time period)/(population during same time period)*100

=(85+8/100)*100

=93%

~0.93

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