Pearson eText for Elementary Statistics: Picturing the World -- Instant Access (Pearson+)

7th Edition

ISBN: 9780137504329

Author: Ron Larson, Betsy Farber

Publisher: PEARSON+

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Textbook Question

Chapter 5.3, Problem 2CS

CASE STUDY Birth Weights in America

The National Center for Health Statistics (NCHS) keeps records of many health-related aspects of people, including the birth weights of all babies born in the United States.

The birth weight of a baby is related to its gestation period (the time between conception and birth). For a given gestation period, the birth weights can be approximated by a normal distribution. The means and standard deviations of the birth weights for various gestation periods are shown in the table below.

One of the many goals of the NCHS is to reduce the percentage of babies born with low birth weights. The figure below shows the percents of preterm births and low birth weights from 2007 to 2015.

Chapter 5.3, Problem 2CS, CASE STUDY Birth Weights in America The National Center for Health Statistics (NCHS) keeps records

2. What percent of the babies born within each gestation period have a low birth weight (under 5.5 pounds)?

(a) 28 to 31 weeks
(b) 32 to 33 weeks
(c) 39 to 40 weeks
(d) 42 weeks and over

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 5.3, Problem 1CS

Chapter 5.3, Problem 3CS

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Chapter 5 Solutions

Pearson eText for Elementary Statistics: Picturing the World -- Instant Access (Pearson+)

Ch. 5.1 - 1. Which normal curve has the greatest mean? 2....Ch. 5.1 - The scaled test scores for the New York State...Ch. 5.1 - A U.S. adult who is at least 20 years old is...Ch. 5.1 - Find the area under the standard normal curve to...Ch. 5.1 - Find the area under the standard normal curve to...Ch. 5.1 - Find the area under the standard normal curve...Ch. 5.1 - Find three real-life examples of a continuous...Ch. 5.1 - In a normal distribution, which is greater, the...Ch. 5.1 - What is the total area under the normal curve?Ch. 5.1 - What do the inflection points on a normal...

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Solution Summary: The author explains that the percent of the babies born within 28 to 31 weeks have a low birth weight (under 5.5 pounds) is 98.79%.

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