12th Edition

ISBN: 9781337630580

Author: Dale Ewen

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…

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency o…

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 15.8, Problem 3E

A laboratory technician records the life span (in months) of rats treated at birth with a fertility hormone. From the following frequency distribution, find the mean life span.

Life span(months)	Midpoint x	Frequency f	Product x f
− 0.5-2.5		12
2.5-5.5		18
5.5-8.5		22
8.5-11.5		30
11.5-14.5		18

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Chapter 15.8, Problem 2E

Chapter 15.8, Problem 4E

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Chapter 15 Solutions

Elementary Technical Mathematics

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A laboratory technician records the life span (in months) of rats treated at birth with a fertility hormone. From the following frequency distribution, find the mean life span. Life span(months) Midpoint x Frequency f Product x f − 0.5-2.5 12 2.5-5.5 18 5.5-8.5 22 8.5-11.5 30 11.5-14.5 18

Solution Summary: The author calculates the mean life span of rats treated at birth with a fertility hormone.

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