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In a random sample of 400 items 80 are found to be defective. The management wants...

  1. In a random sample of 400 items 80 are found to be defective. The management wants to test the null hypothesis that the population defective rate is equal to 0.22. Test this hypothesis at the significance level of 0.01 (perform a two sided test) and perform a lower tail test and an upper tail test for the same problem
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