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Exam 12: Confidence Intervals for Means

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Find correct t* values. -Grandma Gertrude's Chocolates, a family owned business, has an opportunity to Supply its product for distribution through a large coffee house chain. However, the Coffee house chain has certain specifications regarding cacao content as it wishes to Advertise the health benefits (antioxidants) of the chocolate products it sells. In order to Determine the mean % cacao in its dark chocolate products, quality inspectors sample 36 Pieces. They find a sample mean of 55% with a standard deviation of 4%. The correct Value of t* to construct a 90% confidence interval for the true mean % cacao is

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