7. Measures of relative standing (percentiles and quartiles), interquartile range A growth chart is a plot...

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7. Measures of relative standing (percentiles and quartiles), interquartile range A growth chart is a plot of the percentiles 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 for clinical use by health professionals. 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 5th percentile for weights of baby girls at 12-1/2 months is 19.3 pounds. This means that of the 12-1/2-month-old baby girls in the reference population weigh 19.3 pounds or less, and of these baby girls weigh 19.3 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, 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? 85th percentile at 3 months; 85th percentile at 6 months; 90th percentile at 9 months; 95th percentile at 12 months 25th percentile at 3 months; 25th percentile at 6 months; 25th percentile at 9 months; 25th percentile at 12 months 30th percentile at 3 months; 50th percentile at 6 months; 70th percentile at 9 months; 80th percentile at 12 months O 75th percentile at 3 months; 40th percentile at 6 months; 25th percentile at 9 months; 25th 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, equal to this value. out of 11 observations are less than or equal to the 80th percentile, and For any data set, the first quartile is the third quartile is the ▾ percentile. pounds. The third quartile for the prior sample data is percentile, the second quartile is the pounds. out of 11 observations are greater than or percentile and the , and the 7. Measures of relative standing (percentiles and quartiles), interquartile range A growth chart is a plot of the percentiles 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 for clinical use by health professionals. 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 5th percentile for weights of baby girls at 12-1/2 months is 19.3 pounds. This means that of the 12-1/2-month-old baby girls in the reference population weigh 19.3 pounds or less, and of these baby girls weigh 19.3 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, 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? 85th percentile at 3 months; 85th percentile at 6 months; 90th percentile at 9 months; 95th percentile at 12 months 25th percentile at 3 months; 25th percentile at 6 months; 25th percentile at 9 months; 25th percentile at 12 months 30th percentile at 3 months; 50th percentile at 6 months; 70th percentile at 9 months; 80th percentile at 12 months O 75th percentile at 3 months; 40th percentile at 6 months; 25th percentile at 9 months; 25th 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, equal to this value. out of 11 observations are less than or equal to the 80th percentile, and For any data set, the first quartile is the third quartile is the ▾ percentile. pounds. The third quartile for the prior sample data is percentile, the second quartile is the pounds. out of 11 observations are greater than or percentile and the , and the

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7 Measures of relative standing percentiles and quartiles interquartile range The 80th percentile for the sample data given is 254 pounds This means t... View the full answer