Question

completed: 4 of 9 my score: 4/9 pts (44.44%)
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explain the meaning of the accompanying percentiles.
(a) the 10th percentile of the head circumference of males 3 to 5 months of age in a certain city is 41.5 cm.
(b) the 90th percentile of the waist circumference of females 2 years of age in a certain city is 52.7 cm.
(c) anthropometry involves the measurement of the human body. one goal of these measurements is to assess how body measurements may be changing over time. the following table represents the standing height of males aged 20 years or older for various age groups in a certain city in 2015. based on the percentile measurements of the different age groups, what might you conclude?
click the icon to view the data table for part c.
d. 10% of 3- to 5-month-old males have a head circumference that is 41.5 cm or less.
(b) explain the meaning of \the 90th percentile of the waist circumference of females 2 years of age in a certain city is 52.7 cm.\ choose the correct answer below.
a. 10% of 2-year-old females have a waist circumference that is 52.7 cm or less.
b. 90% of 2-year-old females have a waist circumference that is 52.7 cm or less.
c. 90% of females have a waist circumference that is 52.7 cm or less.
d. 90% of 2-year-old females have a waist circumference that is 52.7 cm or more.
(c) anthropometry involves the measurement of the human body. one goal of these measurements is to assess how body measurements may be changing over time. the included table represents the standing height of males aged 20 years or older for various age groups in a certain city in 2015. based on the percentile measurements of the different age groups, what might you conclude?
at each percentile, the heights generally ▼ as the age increases. assuming that an adult male does not grow after age 20, the percentiles imply that adults born in 1990 are generally ▼ than adults who were born in 1950.

Explanation:

For part (b):

A percentile value means that the given percentage of the data set falls at or below that value, and we must specify the correct population group (2-year-old females here).

For part (c):

As males age beyond 20, their height typically decreases due to age-related spinal changes and bone density loss. Adults born in 1990 are younger (in 2015, they are 25 years old) compared to those born in 1950 (65 years old in 2015), and since height percentiles are lower for older groups, younger adults are taller.

Answer:

(b) B. 90% of 2-year-old females have a waist circumference that is 52.7 cm or less.
(c) At each percentile, the heights generally decrease as the age increases. Assuming that an adult male does not grow after age 20, the percentiles imply that adults born in 1990 are generally taller than adults who were born in 1950.