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[Solution Library] In a study of the effects of prenatal cocaine use on infants, the following sample data were obtained at birth: random sample = 25, sample

Question: In a study of the effects of prenatal cocaine use on infants, the following sample data were obtained at birth: random sample = 25, sample mean = 2700g, sample standard deviation = 645g (based on data from "Cognitive Outcomes of Preschool Children with Prenatal Cocaine Exposure", by ‘Singer, et al., Journal of the American Medical Association, Vol. 291, No. 20). Use a one percent significance level to test the claim that weights of babies born to cocaine users have a mean of less than 3103g. Assume the population standard deviation Is unknown.

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