You are interested in the relationship between maternal weight gain during pregnancy and birth weight of infants delivered full-term. Maternal weight is measured at the start of pregnancy and at 39 weeks gestation (considered full-term). Maternal weight gain is categorized as less than 50 pounds or more than 50 pounds. At birth, infants are weighed using a scale that is accurate to 0.1 grams. The graph below shows infant birth weight by maternal weight gain. Question: Which maternal weight gain group had more variability in the infant's birth weight? a50 pounds 50 pounds 2500 2750 3000 3250 3500 3750 4000 4250 4500 Birth weight (grams)

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