5. Measures of location Percentiles and quartiles Aa Aa A growth chart is a plot

Question

5. Measures of location Percentiles and quartiles Aa Aa A growth chart is a plot of the percenbiles of growth measurements, such as weight and height, for a population of infants or children. It is used by pediatricians to assess a child's growth over time. The Centers for Disease Control and Prevention (CDC) is a U.s. agency devoted to the protection and promotion of public health. Through one of its units, the National Center for Health Statistics (NCHS), the CDC has developed growth charts fo clinical use by health professionals. The most recent charts were published in 2000. using a reference population of infants. A pediatrician looks up one of the The 2000 CDC growth charts were develeiped using a reference population of infants. A pediatrician loks up one of the charts and finds that the 10th percentile for weights of baby girls at 7-1/2 months is 16.5 pounds. This means that of the 7-1/2-month-old baby girls in the reference population weigh 16.5 pounds or less, and of these baby girls weigh 16.5 pounds or more. The 2000 CDC growth charts use a reference population of both breast-fed and formula-fed infants. It has been observed that breast-fed babies tend to gain weight more rapidly than formula-fed babies in the first 2 to 3 months of their lives, bu they tend to weigh less than formula-fed babies from 6 to 12 months. Sarah is a healthy baby who was exclusively breast-fed for her first 12 months. Which of the following is most likely a description of her weights (at 3, 6, 9, and 12 months of age) as percentiles of the CDC growth chart reference population O 30th percentile at 3 months; 50th percentile at 6 months; 70th percentile at 9 months; 80th percentile at 12 month O 85th percentile at 3 months; 85th percentile at 6 months; 90th percentile at 9 months; 95th percentile at 12 month O 25th percentile at 3 months; 25th percentile at 6 months; 25th percentile at 9 months; 25th percentile at 12 mont O 75th percenbile at 3 months; 40th percentile at 6 months; 25th percentile at 9 months; 25th percentile at 12 month

Explanation / Answer

10 % of 7-1/2 month baby girls weigh 16.5 pound of less

90 % of those baby girls weigh 16.5 pound or more

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