Bundle: Understandable Statistics: Concepts And Methods, 12th + Webassign, Single-term Printed Access Card

12th Edition

ISBN: 9781337605199

Author: Charles Henry Brase, Corrinne Pellillo Brase

Publisher: Brooks Cole

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Textbook Question

Chapter 6.6, Problem 7P

In the following problems, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities.

Health: Lead Contamination More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, according to the Third National Health and Nutrition Examination Survey (NHANES III) conducted by the Centers for Disease Control and Prevention, only 9% of children in the United States are at risk of high blood-lead levels.

(a) In a random sample of 200 children taken more than a decade ago, what is the probability that 50 or more had high blood-lead levels?
(b) In a random sample of 200 children taken now, what is the probability that 50 or more have high blood-lead levels?

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 6.6, Problem 6P

Chapter 6.6, Problem 8P

Chapter 6 Solutions

Bundle: Understandable Statistics: Concepts And Methods, 12th + Webassign, Single-term Printed Access Card

Ch. 6.1 - Statistical Literacy Which, if any, of the curves...Ch. 6.1 - Statistical Literacy Look at the normal curve in...Ch. 6.1 - Prob. 3P Ch. 6.1 - Critical Thinking Sketch a normal curve (a) with...Ch. 6.1 - Basic Computation: Empirical Rule What percentage...Ch. 6.1 - Basic Computation: Empirical Rule What percentage...Ch. 6.1 - Distribution: Heights of Coeds Assuming that the...Ch. 6.1 - Distribution: Rhode Island Red Chicks The...Ch. 6.1 - Archaeology: Tree Rings At Burnt Mesa Pueblo,...Ch. 6.1 - Vending Machine: Soft Drinks A vending machine...

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Solution Summary: The author explains how the probability of 50 or more had high blood-lead levels when a random sample of 200 children taken more than 10 years ago is approximately 1.

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