Scatter Plots and Correlation

Front

What is a scatter plot?

Back

A scatter plot is a graphical representation of two variables, showing the relationship between them using dots for each data point.

Front

What does correlation mean in statistics?

Back

Correlation refers to a statistical measure that describes the extent to which two variables change together.

Front

What is a positive correlation?

Back

A positive correlation occurs when an increase in one variable leads to an increase in another variable.

Front

What is a negative correlation?

Back

A negative correlation occurs when an increase in one variable leads to a decrease in another variable.

Front

What does it mean if there is no correlation between two variables?

Back

No correlation means that there is no predictable relationship between the two variables.

Front

What is the correlation coefficient (r)?

Back

The correlation coefficient (r) is a numerical value between -1 and 1 that indicates the strength and direction of a linear relationship between two variables.

Front

What does an r value of 0.3 indicate?

Back

An r value of 0.3 indicates a weak positive correlation between the two variables.

Front

How can you determine the type of correlation from a scatter plot?

Back

You can determine the type of correlation by observing the direction of the points: upward slope indicates positive correlation, downward slope indicates negative correlation, and no discernible pattern indicates no correlation.

Front

What is an example of a positive association?

Back

An example of a positive association is the relationship between the age of a kitten and its weight; as the kitten gets older, it generally weighs more.

Front

What is an example of a negative correlation?

Back

An example of a negative correlation is the relationship between outside temperature and the amount of layers you wear; as temperature increases, the number of layers typically decreases.