5. Measures of relative standing (percentiles and quartiles), interquartile rang

Question

5. Measures of relative standing (percentiles and quartiles), interquartile range Aa A growth chart is a plot of the percentiles of growth measurements, such as weight and height, for a population of infants or chiidren. 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 for cinicai use by health professiona's. The most recent charts were published in 2000. The 2000 CDC growth charts were developed using a reference population of infants. A pediatrician looks up one of the charts and finds that the 90th percentile for weights of baby boys at 15-1/2 months is 26.4 poands. This means that of the 15-1/2-month-old baby boys in the reference population weigh less than 26.4 pounds or less, and of these baby boys weigh more than 26.4 pounds. 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, but 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? 25th percentile at 3 months, 2Sth percentile at 6 months, 2Sth percentie at 9 months, 25th centile at 12 months O 85th percentile at 3 months; 85th percentile at 6 months; 90th percentile at 9 months; 95th percentile at 12 months 75th percentile at 3 months; 40th percentile at 6 months; 25th percentile at 9 months; 25th percentile at 12 months O 30th percentile at 3 months; 50th percentile at 6 months; 70th percentile at 9 months; 80th percentile at 12 months The following are weights (in pounds) for a sample of 11 baby girls at the age of 10 months 17.2 18.4 18.8 20.3 20.6 21.1 22 23.5 24.6 25.4 26.8 The 80th percentile for these sample data is In the sample data, greater than this value. out of 11 observations are less than the 80th percentile, and out of 11 observations are MacBook Air 20 F3 F5 #6 F8 F10

Explanation / Answer

90 % of 15-1/2 baby weigh less than 26.4 and 10 % weigh more

option D) is correct

30 percentile 3 months , 50 percentile 6 months , 70 percentile 9 months , 80 percentile 12 months ,

80 percentile is 24.6

8 out of 11 less than 80 percentile ,

2 out of 11 more than 80 percentile

first quartile is 25%

second quartile is 50%

third quartile is 75%

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25 19.55 75 24.05 IQR 4.5

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