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Average percentage of alcohol in all bottles of the new wine

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Question: A wine importer needs to report the average percentage of alcohol in bottles of French wine. From experience with previous kinds of wine, the importer believes the population standard deviation is 1.2%. The importer randomly samples 60 bottles of the new wine and obtains a sample mean x¯ = 9.3%. Give a 90% confidence interval for the average percentage of alcohol in all bottles of the new wine.

Reference no: EM131693982

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