7.3 Describing Scatterplots Lesson Check

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 a positive correlation indicate in a scatterplot?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate in a scatterplot?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What is the correlation coefficient?

Back

The correlation coefficient is a numerical measure of the strength and direction of a relationship between two variables, ranging from -1 to 1.

Front

What does a correlation coefficient of 1 mean?

Back

A correlation coefficient of 1 means there is a perfect positive linear relationship between the two variables.

Front

What does a correlation coefficient of -1 mean?

Back

A correlation coefficient of -1 means there is a perfect negative linear relationship between the two variables.

Front

What does a correlation coefficient of 0 mean?

Back

A correlation coefficient of 0 means there is no linear relationship between the two variables.

Front

What is causation?

Back

Causation implies that one variable directly affects another variable.

Front

How can you estimate the correlation coefficient from a scatterplot?

Back

You can estimate the correlation coefficient by observing the direction and tightness of the points clustered around a line.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation indicates that one variable directly influences the other.