12th Edition

ISBN: 9780100460461

Author: Anderson

Publisher: YUZU

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A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

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Textbook Question

Chapter 6, Problem 45SE

Is lack of sleep causing traffic fatalities? A study conducted under the auspices of the National Highway Traffic Safety Administration found that the average number of fatal crashes caused by drowsy drivers each year was 1550 (BusinessWeek, January 26, 2004). Assume the annual number of fatal crashes per year is normally distributed with a standard deviation of 300.

a. What is the probability of fewer than 1000 fatal crashes in a year?
b. What is the probability the number of fatal crashes will be between 1000 and 2000 for a year?
c. For a year to be in the upper 5% with respect to the number of fatal crashes, how many fatal crashes would have to occur?

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, Problem 44SE

Chapter 6, Problem 46SE

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Chapter 6 Solutions

EBK STATISTICS FOR BUSINESS & ECONOMICS

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Solution Summary: The author calculates the probability of fewer than 1,000 fatal crashes in a year by using MINITAB software.

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Chapter 6 Solutions