Unacceptable bacterial contamination on 20 flights. a at, Ask an Expert

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The EPA is concerned about the quality of drinking water served on airline flights. In September 2004, a sample of 158 flights found unacceptable bacterial contamination on 20 flights. (a) At α = .05, does this sample show that more than 10 percent of all flights have contaminated water? (b) Find the p-value.

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