Question
18. Measures of location Percentiles and quartiles Aa Aa 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 boys at 10-1/2 months is 16.7 pounds. This means that of the 10-1/2-month-old baby boys in the reference population weigh 16.7 pounds or less, and of these baby boys weigh 16.7 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? O 70th percentile at 3 months; 40th percentile at 6 months; 30th percentile at 9 months; 25th percentile at 12 months 80th percentile at 9 months; 90th percentile at 12 months entile at 3 months; 80th percentile at 6 months; 80th percentile at 9 months; 90th percentile at 12 months 40th percentile at 6 months; 40th percentile at 9 months; 40th percentile at 12 months O 20th percentile at 3 months; 50th percentile at 6 months; 80th perc O 40th percentile at 3 months;
Explanation / Answer
We are allowed to do 4 subparts question at a time. Post again for more subparts of question.
1) It means 5% of weights weill be less and 95% will me greater
2) A options as weights for breast fed will be lesser than formula fed as percentile increases.
3) 24.6 pounds is 80 percentile.
4) 8 Obs are less and 3 are greater
5) 25th, 50th and median, 75th
6) Quartile Q1: 19.55
Quartile Q2: 21.1
Quartile Q3: 24.05
IQR = 5.5
