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You measure the caffeine content in 40 coffees from a particular espresso machine and calculated a sample mean of of 11 mg/ounce, with a sample

You measure the caffeine content in 40 coffees from a particular espresso machine and calculated a sample mean of of 11 mg/ounce, with a sample standard deviation of 1 mg/ounce. Create a 99% confidence interval for the true mean amount of caffeine in these coffees.

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