Answered: A random sample of 126 police officers…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A random sample of 126 police officers subjected to constant inhalation of automobile exhaust
fumes in downtown Cairo, had an average blood lead level concentration of 29.2 μg/dl. Assume
x, the blood lead level of a randomly selected policeman, is normally distributed with a standard
deviation of σ = 7.5 μg/dl. Historically, it is known that the average blood lead level concentration
of humans with no exposure to automobile exhaust is 18.2 μg/dl. Construct 90% confidence
interval estimator for average blood lead level.

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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