18. Dr. Yue Chen (A-31), in an article in the American Journal of Public Health, presents information

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18. Dr. Yue Chen (A-31), in an article in the American Journal of Public Health, presents information on some factors associated with the infant-feeding practices of mothers in Shanghai. This investigator found that, among 1706 male infants, 35.9 percent were artificially fed. Among 1579 female infants, 32.9 percent were artificially fed. Is the proportion of artificially fed infants significantly higher among males than females? Let a = .10.

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