Scatterplots & 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 (trend) of the data points.

Front

How do you determine the slope of a line from a scatterplot?

Back

The slope of a line is determined by the change in the y-values divided by the change in the x-values (rise over run) between two points on the line.

Front

What is a positive association in a scatterplot?

Back

A positive association occurs when, as one variable increases, the other variable also increases, resulting in an upward trend in the scatterplot.

Front

What is a negative association in a scatterplot?

Back

A negative association occurs when, as one variable increases, the other variable decreases, resulting in a downward trend in the scatterplot.

Front

What does no association mean in a scatterplot?

Back

No association means that there is no discernible pattern or relationship between the two variables; the points are scattered randomly.

Front

What is the equation of a line in slope-intercept form?

Back

Front

How can you find the y-intercept from a scatterplot?

Back

Front

What is the purpose of using a line of best fit?

Back

The purpose of using a line of best fit is to summarize the relationship between two variables and make predictions based on the trend.

Front

What does it mean if a scatterplot has a perfect association?

Back

A perfect association means that all data points lie exactly on a straight line, indicating a consistent relationship between the variables.