7th Edition

ISBN: 9780135901021

Author: Larson

Publisher: PEARSON EDUCATION (COLLEGE)

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 9, Problem 4CT

For Exercises 2–9, use the data in the table, which shows the average annual salaries (both in thousands of dollars) for librarians and postsecondary library science teachers in the United States for 12 years. (Source: Bureau of Labor Statistics)

Librarians, x	Library science teachers y
49.1	56.6
50.9	57.6
52.9	59.7
54.7	61.6
55.7	64.3
56.4	67.0
57.0	70.0
57.2	70.8
57.6	73.3
58.1	72.4
58.9	73.0
59.9	72.3

4. Test the significance of the correlation coefficient r that you found in Exercise 3. Use α = 0.01.

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Chapter 9, Problem 3CT

Chapter 9, Problem 5CT

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Chapter 9 Solutions

MYLAB STATISTICS: ELEMENTARY STATISTICS

Ch. 9.1 - A director of alumni affairs at a small college...Ch. 9.1 - A researcher conducts a study to determine whether...Ch. 9.1 - Consider the data on page 469 on the salaries and...Ch. 9.1 - Calculate the correlation coefficient for the...Ch. 9.1 - Use technology to calculate the correlation...Ch. 9.1 - In Try It Yourself 4, you calculated the...Ch. 9.1 - In Try It Yourself 5, you calculated the...Ch. 9.1 - Two variables have a positive linear correlation....Ch. 9.1 - Describe the range of values for the correlation...Ch. 9.1 - What does the sample correlation coefficient r...

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Solution Summary: The author concludes that there is a linear correlation between the average annual salaries of librarians and the library science teachers.

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