Question: 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,

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 the table below.

O A B AB

Rh positive 82 89 54 19

Rh negative 13 27 7 9

Test the hypothesis that the two classifications of blood types are independent. (=0.05). Compute

the p-value.

Answers. Q = 8.6. 0.025

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