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 4, Problem 51SE

Pitchers The table shows the Earned Run Average (ERA) and WHIP rating (walks plus hits per inning) for the top 40 Major League Baseball pitchers in the 2017 season. Top pitchers will tend to have low ERA and WHIP ratings. (Source: ESPN.com)

a. Make a scatterplot of the data and state the sign of the slope from the scatterplot. Use WHIP to predict ERA.

b. Use linear regression to find the equation of the best-fit line. Show the line on the scatterplot using technology or by hand.

c. Interpret the slope.

d. Interpret the y-intercept or explain why it would be inappropriate to do so.

Chapter 4, Problem 51SE, Pitchers The table shows the Earned Run Average (ERA) and WHIP rating (walks plus hits per inning) , example 1

Chapter 4, Problem 51SE, Pitchers The table shows the Earned Run Average (ERA) and WHIP rating (walks plus hits per inning) , example 2

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Chapter 4, Problem 50SE

Chapter 4, Problem 52SE

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Chapter 4 Solutions

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Solution Summary: The author explains how to obtain the Scatterplot with the best fit line using Excel.

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