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21. A study found that 12.5% of U.S. workers belonged to unions. Suppose a sample of 400 workers is collected to determine whether union efforts

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21. A study found that 12.5% of U.S. workers belonged to unions. Suppose a sample of 400 workers is collected to determine whether union efforts to organize have increased union membership. The sample results show that 52 of the workers belonged to unions. State the null and alternative hypotheses and test whether union membership has increased using the p-value approach at the 5% level. Show your work. (10pts)

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