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In the case of Casteneda v. Partida, it was found that during a period of 11 years in Hilda Country, Texas, 870 people were selected for grand jury duty, and 39% of them were Americans of Mexican ancestry. Among the people eligible for grand jury duty, 79.1% were Americans of Mexican ancestry.

a) Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry.

b) Does the jury selection system appear to be fair?

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