Scatterplots

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 does no correlation mean in a scatterplot?

Back

No correlation means there is no apparent relationship between the two variables; changes in one variable do not predict changes in the other.

Front

How can you identify a strong correlation in a scatterplot?

Back

A strong correlation is indicated by points that are closely clustered around a straight line, either positively or negatively.

Front

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

Back

The slope of a trend line indicates the rate of change between the two variables; it shows how much one variable changes for a unit change in the other variable.

Front

What does it mean if the slope of a trend line is positive?

Back

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

Front

What does it mean if the slope of a trend line is negative?

Back

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

Front

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

Back

A trend line helps to summarize the relationship between the variables and can be used to make predictions.

Front

How do you determine the strength of a correlation?

Back

The strength of a correlation can be determined by how closely the data points cluster around the trend line; the closer they are, the stronger the correlation.