Suppose that 300 persons are selected at random from a large population, and each person in the sample is classified according to blood type, O, A, B, or AB, and also according to Rh, positive or negative. The observed numbers are given in Table 10.18. Test the hypothesis that the two classifications of blood types are independent.
Table 10.18 Data for Exercise 5

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O A B AB Rh positive Rh negative 13 27 5419 7 82 89