42 eight-ounce servings has a mean caffeine content of 146, Ask an Expert

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A coffee shop claims that its fresh-brewed drinks have a mean content of 140 milligrams per 8 ounces. You want to test this claim. You find that a random sample of 42 eight-ounce servings has a mean caffeine content of 146 milligrams and a standard deviation of 22 milligrams. At α = .10, do you have enough evidence to reject the shop's claim?

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Statistics and Probability, Statistics

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