Suppose that the melting point of a brand of ice cream is normally distributed with variance 2 2 69C How large of a sample size is needed to guarantee that the precision of a 90 confidence interval on the mean melting point is at most 1 38 ...

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Suppose that the melting point of a brand of ice cream is normally distributed with variance 2 = 2.69C. How large of a sample size

Suppose that the melting point of a brand of ice cream is normally distributed with variance²= 2.69C. How large of a sample size is needed to guarantee that the precision of a 90% confidence interval on the mean melting point is at most 1.38?

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