Scatterplots and Trendlines

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 in a scatterplot indicate?

Back

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

Front

What does a negative correlation in a scatterplot indicate?

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

What is a trendline?

Back

A trendline is a line that is drawn on a scatterplot to show the general direction of the data points.

Front

How can you use a trendline to make predictions?

Back

You can use a trendline to estimate the value of one variable based on the value of another variable by finding where the point falls on the trendline.

Front

What is the purpose of analyzing scatterplots?

Back

Analyzing scatterplots helps to identify relationships between variables, such as correlation and trends.

Front

What is the difference between correlation and causation?

Back

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

Front

How do you determine the type of association from a scatterplot?

Back

You determine the type of association by observing the direction of the trendline: upward for positive, downward for negative, and scattered for no association.

Front

What is the significance of outliers in a scatterplot?

Back

Outliers are data points that differ significantly from other observations and can affect the overall trend and correlation.