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A random sample of 900 maternity ward records from a hospital in a low SES (socioeconomic status) area yielded a sample average birth weight of

A random sample of 900 maternity ward records from a hospital in a low SES (socioeconomic status) area yielded a sample average birth weight of 115 oz. Previous research has shown that the (true) standard deviation of birth weights in this population is 24 oz. Find a 99% confidence interval for the true average birth weight of low SES area babies

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