The proportions of blood types O, A, B and AB in the general population of a particular country are known to be in the ratio 49:38:9:4, respectively. A research team, investigating a small isolated community in the country, obtained the following frequencies of blood type. Blood type O A B AB Frequency 87 59 20 4     a) Test the hypothesis that the proportions in this community do not differ significantly from those in the general population   b) Interpret your results.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.