Statistics Solutions

[Steps Shown] Birth Weights In a study of the effects of prenatal cocaine use on infants, the follow-ing sample data were obtained for weights at birth:

Question: Birth Weights In a study of the effects of prenatal cocaine use on infants, the follow-ing sample data were obtained for weights at birth: n = 190, \(\bar{X}\) = 2700 g, s = 645 g (based on data from "Cognitive Outcomes of Preschool Children with Prenatal Co-caine Exposure," by Singer et al., Journal of the American Medical Association. Vol 291, No. 20). Use a 0.01 significance level to test the claim that weights of babies born to cocaine users have a mean that is less than the mean of 3103 g for babies bozo to mothers who do not use cocaine. Based on the results, does it appear that birds weights are affected by cocaine use?

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