1CHAPTER 8: TESTS OF SIGNIFICANCE 8.1Tests about the mean when σis known Example: Canada Packers claims that the average fat content μof its ground beef is 10%. A consumer agency took a random sample of n=100 packages and determined the fat content of each one. It was found that x= 10.6 (percent). Is there sufficient evidence to conclude that Canada Packers claim is false? Assume that standard deviation σ=2.Population Random Sample of 100 packages x= 10.6 Two alternative claims: 1. Canada Packers (CP): μ=10 2. Consumer Agency: μ>10 μ=10
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