3rd Edition

ISBN: 9780135188927

Author: Gould, Robert, Ryan, Colleen N. (colleen Nooter)

Publisher: Pearson,

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 65SE

Teacher Pay and Expenditure Per Student (Example 9) The scatterplot shows the average teacher pay and the per pupil expenditure for each of the 50 states and the District of Columbia. The regression equation is also shown. (Source: The 2017 World Almanac and Book of Facts).

Chapter 4, Problem 65SE, Teacher Pay and Expenditure Per Student (Example 9) The scatterplot shows the average teacher pay

a. From the scatterplot is the correlation between average teacher pay and per pupil expenditure positive, negative, or near zero?

b. What is the slope of the regression equation? Interpret the slope in the context of the problem.

c. What is the y-intercept of the regression equation? Interpret the y-intercept or explain why it would be inappropriate to do so for this problem.

d. Use the regression equation to estimate the per pupil expenditure for a state with an average teacher pay of $ 60 , 000 .

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Chapter 4, Problem 64SE

Chapter 4, Problem 66SE

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Chapter 4 Solutions

Introductory Statistics

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Solution Summary: The author analyzes the correlation between average teacher salary and average expenditure per pupil for 50 states. The best fit line is rising with the positive slope.

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