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Consider the following contingency table of observed frequencies. Complete parts a. through e. below.

a. Identify the null and alternative hypotheses for a chi-square test of independence based on the information in the table. This test will have a significance level of alpha = 0.025. Choose the correct answer 

  C1 C2 C3
R1 21 7 20
R2 6 6 11
R3 12 16 5