3rd Edition

ISBN: 9780135190210

Author: Gould

Publisher: PEARSON CO

Concept explainers

Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.

Linear Correlation

A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.

Regression Analysis

Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as p…

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Textbook Question

Chapter 1, Problem 19SE

Investigating Data (Example 4) A data set on Shark Attacks Worldwide posted on StatCrunch records data on all shark attacks in recorded history including attacks before 1800. Variables contained in the data include time of attack, date, location, activity the victim was engaged in when attacked, type of injuries sustained by the victim, whether or not the injury was fatal, and species of shark. Which of the following questions could not be answered using this data set? (Source: www.sharkattackfile.net)

a. In what month do most shark attacks occur?

b. Are shark attacks more likely to occur in warm temperature or cooler temperatures?

c. Attacks by which species of shark are more likely to result in a fatality?

d. What country has the most shark attacks per year?

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Chapter 1, Problem 18SE

Chapter 1, Problem 20SE

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Chapter 1 Solutions

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Solution Summary: The author explains that the data set does not contain any information about the temperature during the attack, due to a large shift in temperature since 1800.

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