2nd Edition

ISBN: 9781260189346

Author: sobecki, David

Publisher: MCGRAW-HILL HIGHER EDUCATION

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 2, Problem 28LOR

Runners often keep a training log to keep track of the distance they run over a period of time. Nikki’s running log is displayed here showing total miles run by month for 2015 and 2016.

	Miles in 2015	Miles in 2016
Jan	40	29
Feb	43	48
March	38	48
April	49	21
May	47	44
June	55	80
July	55	80
Aug	35	10
Sept	42	49
Oct	48	45
Nov	29	43
Dec	35	38

Compute the standard deviation for the miles run for each year. Feel free to use your favorite form of technology to assist with the calculations.

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Chapter 2, Problem 27LOR

Chapter 2, Problem 29LOR

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Chapter 2 Solutions

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Solution Summary: The author explains that the standard deviation for the year 2015 and 2016 is 6.87 and 19.75, based on the running log of Niki.

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