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A Wall Street Journal poll (What #x27;s News Online. The Wall Street Journal. March 30, 2004. D7) asked respondents if they trusted energy-efficiency ratings on cars and appliances. 552 responded yes, and 531 responded no. At the 0.05 level of significance, the six-step critical value approach to hypothesis-testing is used to try to prove that the percentage of people who trust energy-efficiency ratings differs from 50

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