statistics at helpwithassignment.com (correlation)

1 / 13

# statistics at helpwithassignment.com (correlation) - PowerPoint PPT Presentation

In Statistics Correlation denotes the relation between to variables. If change in one variable is initiating change in the other variable then it is said that there is a correlation between them. There are two kinds of correlation. One is Positive Correlation and the other is Negative Correlation./n

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'statistics at helpwithassignment.com (correlation)' - assignment_maker

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Statistics at HelpWithAssignment.com

(Correlation)

www.HelpWithAssignment.com

Correlation
• In Statistics Correlation denotes the relation between to variables.
• If change in one variable is initiating change in the other variable then it is said that there is a correlation between them.
• There are two kinds of correlation. One is Positive Correlation and the other is Negative Correlation.
• www.HelpWithAssignment.com
Correlation
• Positive Correlation is said to exist when a change in one variable is causing a positive change in the other variable as well then it is called Positive Correlation.
• For example, there is said to be a Positive Correlation between Income and spending. As income increases so is the purchasing power and spending.
• www.HelpWithAssignment.com
Correlation
• Negative Correlation on the other hand is a positive change in one variable causes a negative change in the other variable.
• The best example for this is the demand theory in Economics.
• We all know that when price of a product increases then the demand of that product decreases and when the price of the product decreases then the demand increases.
• www.HelpWithAssignment.com
Correlation
• The result of Correlation can only range between -1.00 and +1.00. If the answer is -1.00 then it is called perfect Negative Correlation and +1.00 denotes a perfect Positive Correlation. 0.00 denotes that there is no correlation at all.
• Let us understand the process of Correlation with a good example.
• www.HelpWithAssignment.com
Correlation Example Problem
• www.HelpWithAssignment.com
Correlation Example Problem
• www.HelpWithAssignment.com
Correlation Example Problem
• The Mean of X and Y are calculated to be 4.7 and 79.9 respectively. The Standard Deviation of X and Y are calculated to be 2.1628 and 11.5706 respectively.
• Now, the formula for Correlation Coefficient or Karl Pearson Correlation (r) is
• r =
• www.HelpWithAssignment.com
Correlation Example Problem
• Here, we can observe that the ∑XY = 3939; N is the means of X and Y, calculated to be 4.7 and 79.9 respectively. Standard Deviation is denoted by Sxand Sy which are calculated to be 2.1628 and 11.5706. When we apply the values we get
• r =
• www.HelpWithAssignment.com

Correlation Example Problem

• r = =

= 0.8156 = 0.82

• www.HelpWithAssignment.com
Correlation Example Problem
• The Coefficient Determination = r2 = 0.822 = 0.67 or 67%.
• Therefore, we can conclude that the score in exams is directly related to the number of hours studied to a significant extent. And we can say that there is a positive correlation between the Number of hours Studied and the Scores obtained in Exams.
• www.HelpWithAssignment.com
HelpWithAssignment.com
• At HelpWithAssignment.com we provide best quality Assignment help, Homework help, Online Tutoring and Thesis and Dissertation help as well. For any of the above services you can contact us at http://www.helpwithassignment.com/ andhttp://www.helpwithassignment.com/statistics-assignment-help
• www.HelpWithAssignment.com
HelpWithAssignment.com
• You can follow us on our blogs at http://helpwithassignment.blogspot.com/ and

http://helpwithassignment.wordpress.com/

Thank You

• www.HelpWithAssignment.com