Scatterplots

Front

What is a scatterplot?

Back

A scatterplot is a graph that shows the relationship between two quantitative variables. Each point on the graph represents an observation.

Front

What do the axes represent in a scatterplot?

Back

The horizontal axis (x-axis) represents one variable, while the vertical axis (y-axis) represents another variable.

Front

How do you interpret the correlation in a scatterplot?

Back

Correlation indicates the strength and direction of a relationship between two variables. Positive correlation means as one variable increases, the other also increases. Negative correlation means as one variable increases, the other decreases.

Front

What does a scatterplot with no correlation look like?

Back

A scatterplot with no correlation shows points that are scattered randomly, indicating no predictable relationship between the variables.

Front

What is a positive correlation?

Back

A positive correlation occurs when two variables move in the same direction; as one variable increases, the other variable also increases.

Front

What is a negative correlation?

Back

A negative correlation occurs when two variables move in opposite directions; as one variable increases, the other variable decreases.

Front

What is the purpose of a trend line in a scatterplot?

Back

A trend line is used to show the general direction of the data points in a scatterplot, helping to visualize the relationship between the variables.

Front

What does it mean if a scatterplot has a strong correlation?

Back

A strong correlation means that the data points are closely clustered around the trend line, indicating a strong relationship between the two variables.

Front

What does it mean if a scatterplot has a weak correlation?

Back

A weak correlation means that the data points are more spread out from the trend line, indicating a weaker relationship between the two variables.

Front

How can outliers affect a scatterplot?

Back

Outliers are data points that are significantly different from others. They can skew the interpretation of the correlation and affect the trend line.