You generate a scatter plot using Excel. You then have Excel plot the trend line and report the equation and the r2 value. The regression equation is reported as y = 96.35z + 77.69 and the r2 = 0.36. What is the correlation coefficient for this data set?
You generate a scatter plot using Excel. You then have Excel plot the trend line and report the equation and the r2 value. The regression equation is reported as y = 96.35z + 77.69 and the r2 = 0.36. What is the correlation coefficient for this data set?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Concept explainers
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
Question
![### Linear Regression and Correlation Coefficient
When performing a linear regression analysis, you typically generate a scatter plot using software like Excel. The next step is to plot the trend line and find the corresponding regression equation and \( r^2 \) value.
In this example, Excel reports the regression equation as:
\[ y = 96.35x + 77.69 \]
Additionally, it provides the \( r^2 \) value:
\[ r^2 = 0.36 \]
To understand the strength and direction of the linear relationship between the variables, we need to calculate the correlation coefficient, denoted as \( r \).
**Question: What is the correlation coefficient for this data set?**
You can calculate the correlation coefficient by taking the square root of \( r^2 \). Since \( r^2 = 0.36 \), we compute \( r \) as follows:
\[ r = \sqrt{0.36} \]
Since \( r \) can be either positive or negative depending on the direction of the relationship:
\[ r = \pm 0.6 \]
So, the correlation coefficient for this data set can be \( +0.6 \) or \( -0.6 \), indicating a moderate positive or negative linear relationship, respectively. The actual sign of \( r \) would depend on the nature of the data and the slope of the regression line. Given that the slope of the regression equation \( 96.35 \) is positive, \( r \) would be \( +0.6 \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fae9dff02-6614-4387-a434-63ee01638e81%2F8535d76a-4c2c-4f5a-86a1-45efdf946257%2Fa9e6w8b_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Linear Regression and Correlation Coefficient
When performing a linear regression analysis, you typically generate a scatter plot using software like Excel. The next step is to plot the trend line and find the corresponding regression equation and \( r^2 \) value.
In this example, Excel reports the regression equation as:
\[ y = 96.35x + 77.69 \]
Additionally, it provides the \( r^2 \) value:
\[ r^2 = 0.36 \]
To understand the strength and direction of the linear relationship between the variables, we need to calculate the correlation coefficient, denoted as \( r \).
**Question: What is the correlation coefficient for this data set?**
You can calculate the correlation coefficient by taking the square root of \( r^2 \). Since \( r^2 = 0.36 \), we compute \( r \) as follows:
\[ r = \sqrt{0.36} \]
Since \( r \) can be either positive or negative depending on the direction of the relationship:
\[ r = \pm 0.6 \]
So, the correlation coefficient for this data set can be \( +0.6 \) or \( -0.6 \), indicating a moderate positive or negative linear relationship, respectively. The actual sign of \( r \) would depend on the nature of the data and the slope of the regression line. Given that the slope of the regression equation \( 96.35 \) is positive, \( r \) would be \( +0.6 \).
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps with 2 images

Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.Recommended textbooks for you

MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc

Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning

MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc

Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning

Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON

The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman

Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman