Find a 90% confidence interval for the mean amount of sugar

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Julie is interested in the sugar content of vanilla ice cream. She obtains a random sample of n = 20 brands and finds an average of 18.05 g with standard deviation 5 g (per half cup serving). Assuming that the data come from a normal distribution, find a 90% confidence interval for the mean amount of sugar in a half cup serving of vanilla ice cream.

Reference no: EM131420789

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