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In order to study the genetic history of three different large groups of native Americans, a random sample of 50 persons is drawn from group 1; a random sample of 100 persons is drawn from group 2; and a random sample of 200 persons is drawn from group 3. The blood type of each person in the samples is classified as A, B, AB, or 0, and the results are as given in Table 9.42. Test the hypothesis that the distribution of blood types is the same in all three groups at the level of significance 0.1.

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