8th Edition

ISBN: 9781305104174

Author: David B. Johnson, Thomas A. Mowry

Publisher: Cengage Learning

Concept explainers

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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Chapter 4.3, Problem 1E

Perform each task, given the following sample data:

3 8 5 3 10 13

a. Use the Sample Variance Definition to find the variance and standard deviation of the data.

b. Use the Alternative Formula for Sample Variance to find the variance and standard deviation of the data.

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Chapter 4.2, Problem 36E

Chapter 4.3, Problem 2E

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Chapter 4 Solutions

Mathematics: A Practical Odyssey

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Perform each task, given the following sample data: 3 8 5 3 10 13 a. Use the Sample Variance Definition to find the variance and standard deviation of the data. b. Use the Alternative Formula for Sample Variance to find the variance and standard deviation of the data.

Solution Summary: The author explains that the variance and standard deviation of the given data is 16.4 and 4.0 respectively.

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