5th Edition

ISBN: 9780321924599

Author: Mario F. Triola

Publisher: PEARSON

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The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of tw…

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Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow compar…

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Textbook Question

Chapter 2.2, Problem 12BSC

Normal Distributions. In Exercises 11-14, answer the given questions which are related to normal distributions.

12. Identifying the Distribution Does the frequency distribution given in Exercise 7 appear to have a normal distribution? Explain.

Verbal IQ Score of Subject Exposed to Lead	Frequency
50-59	4
60-69	10
70-79	25
80-69	43
90-99	26
100-109	8
110-119	3
120-129	2

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 2.2, Problem 11BSC

Chapter 2.2, Problem 13BSC

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Chapter 2 Solutions

Essentials of Statistics (5th Edition)

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Solution Summary: The author explains that the frequency distribution of verbal IQ score of subject exposed to lead follows normal distribution.

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