An Introduction to Statistical Methods and Data Analysis

7th Edition

ISBN: 9781305269477

Author: R. Lyman Ott, Micheal T. Longnecker

Publisher: Cengage Learning

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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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Chapter 4.18, Problem 79E

Psychomotor retardation scores for a particular group of manic-depressive patients have approximately a normal distribution with a mean of 930 and a standard deviation of 130. A random sample of 20 patients from the group was selected, and their mean psychomotor retardation score was obtained.

a. What is the probability that their mean score was between 900 and 960?
b. What is the probability that their mean score was greater than 960?
c. What is the 90th percentile of their mean scores?

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 4.18, Problem 78E

Chapter 4.18, Problem 80E

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Chapter 4 Solutions

An Introduction to Statistical Methods and Data Analysis

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