Zinc for Mothers A study of zinc-deficient mothers was conducted to determine whether zinc supplementation during pregnancy results in babies with increased weights at birth. Sample data are listed in the margin (based on data from “The Effect of Zinc Supplementation on Pregnancy Outcome,” by Goldenberg et al., Journal of the American Medical Association, Vol. 274, No. 6). The weights were measured in grams. Using a 0.05 significance level, is there sufficient evidence to support the claim that zinc supplementation does result in increased birth weights?