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A species of sea snail known as Janet's turrid is found in the Atlantic Ocean and the Gulf of Mexico. A random sample of 19

A species of sea snail known as Janet's turrid is found in the Atlantic Ocean and the Gulf of Mexico. A random sample of 19 specimens of this creature has a mean length of 1.86 cm. If we assume that the population is normally distributed with = .37 cm, find a 95% confidence interval for the mean length of all Janet's turrids.

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