Scatterplots, correlation and line of best fit

Front

What is a scatterplot?

Back

A scatterplot is a graph that displays values for typically two variables for a set of data. Each point represents an observation in the dataset.

Front

What does the line of best fit represent in a scatterplot?

Back

The line of best fit is a straight line that best represents the data on a scatterplot. It shows the general direction of the data points.

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or no correlation.

Front

What is a positive correlation?

Back

A positive correlation means that as one variable increases, the other variable also increases.

Front

What is a negative correlation?

Back

A negative correlation means that as one variable increases, the other variable decreases.

Front

What does no correlation mean?

Back

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

Front

How can you identify a positive correlation in a scatterplot?

Back

In a scatterplot, a positive correlation is identified when the points tend to rise from left to right.

Front

How can you identify a negative correlation in a scatterplot?

Back

In a scatterplot, a negative correlation is identified when the points tend to fall from left to right.

Front

What is the purpose of the line of best fit?

Back

The purpose of the line of best fit is to summarize the relationship between the variables and to make predictions.

Front

What is an example of a situation with positive correlation?

Back

An example of positive correlation is the relationship between hours studied and test scores; generally, more study hours lead to higher scores.