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# Correlation

## Correlational Study Example

❶I guess there is a relationship between height and self esteem, at least in this made up data! A correlation can differ in the degree or strength of the relationship with the Pearson product-moment correlation coefficient that relationship is linear.

## Techniques in Determining Correlation

As more people bowl in the US, more domestic violence occurs, which is correlational research. Does that mean in this correlational study example that bowling causes domestic violence- like you had bad game and take it out on a loved one.

Or domestic violence causes bowling- like you fight with a sibling and feel the need to take it out on some pins. As you have already guessed- one does not cause the other to occur, but they are related- for every time people bowl, I can predict that domestic violence will go up, and every time domestic violence goes down I should be able to find a lane at the local bowling alley.

There is a hidden variable that links both of them together. In this case it is winter time. In the winter more people bowl and more people stay in their homes which increases the chances of domestic violence. Before we examine the different types of correlational research methods, understand that correlations can go in two directions; positive and negative. For example, domestic violence and bowling. When bowling goes up, so does domestic violence.

When domestic violence decreases, so does bowling. For example, consumption of garlic and dating now I am making this one up. The less garlic you eat, the more you date. The more garlic you eat, the less the date. One variable going in one direction can be used to predict the other variable going in the opposite direction. Scientists measure the strength of a correlation by using a number called a correlational coefficient. Now you do not have to know how they get the number, but you should know what it means when you see it.

The the number is below zero like -. If two variables have a correlation of zero then they have NO relationship with each other. The strength has nothing to do with whether the number is positive of negative. A correlation of -. There are many different ways to show a correlation between two variables.

Perhaps the most common type of research around is survey research. Every time you receive a letter in the mail asking you to take a minute and answer a few questions, or get a phone call begging for ten minutes of your time to speak about how you feel about?????? All surveys have one thing in common, they ask questions. Now there are good and bad things about surveys in research.

The good- no matter how you do it, internet, mail, phone, in person- they are fairly cheap. You can cover large populations of people easily if you use the phone or internet. The bad aspects of surveys is that 1. Second, people can lie on the survey so you can always question the validity of your data. Pretend our hypothesis was the more garlic people eat, the less they date.

## Main Topics

A correlation is simply defined as a relationship between two variables. Researchers using correlations are looking to see if there is a relationship between two variables. This relationship is represented by a correlation coefficient, defined as a numerical representation of the strength and direction of .

### Privacy FAQs

A correlation can differ in the degree or strength of the relationship (with the Pearson product-moment correlation coefficient that relationship is linear). Zero indicates no relationship between the two measures and r = or r = indicates a perfect relationship.