(Answered) In a study of the effects of marijuana use during pregnancy

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In a study of the effects of marijuana use during pregnancy, measurements on babies of mothers who used marijuana during pregnancy were compared to measurements on babies of mothers who did not (New England Journal of Medicine). A 95% confidence interval for the difference in mean head circumference (nonuse minus use) was .61 to 1.19 cm. What can be said from this statement about a p-value for testing the hypothesis that the mean difference is zero?

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