The average normal infant born in the United States weighs between twelve and fourteen pounds at the age of three months. Therefore, if a three-month-old child weighs only ten pounds, its weight gain has been below the United States average. Which of the following indicates a aw in the reasoning above?Choose the best optionClear ResponseWeight is only one measure of normal infant developmentSome three-month-old children weigh as much as seventeen poundsIt is possible for a normal child to weigh ten pounds at birth.Average weight gain is not the same as average weight.
Question
The average normal infant born in the United States weighs between twelve and fourteen pounds at the age of three months. Therefore, if a three-month-old child weighs only ten pounds, its weight gain has been below the United States average. Which of the following indicates a aw in the reasoning above?Choose the best optionClear ResponseWeight is only one measure of normal infant developmentSome three-month-old children weigh as much as seventeen poundsIt is possible for a normal child to weigh ten pounds at birth.Average weight gain is not the same as average weight.
Solution
The flaw in the reasoning above is that it equates average weight with average weight gain, which are not the same thing. The statement assumes that if a three-month-old child weighs less than the average, its weight gain must also be below average. However, this is not necessarily true. A child could weigh less than average at birth and still have an average or above average weight gain. Therefore, the correct answer is "Average weight gain is not the same as average weight."
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