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 of the relationship between the two variables.

Front

How do you determine the slope of a line from its equation?

Back

Front

What does a positive slope indicate in a scatterplot?

Back

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

Front

What does a negative slope indicate in a scatterplot?

Back

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

Front

What is the formula for the slope between two points (x1, y1) and (x2, y2)?

Back

Front

What does it mean if there is no correlation in a scatterplot?

Back

No correlation means that there is no apparent relationship between the two variables; the points are scattered randomly.

Front

What is the y-intercept in the equation of a line?

Back

Front

How can you predict values using the line of best fit?

Back

You can predict values by substituting the x-value into the equation of the line of best fit to find the corresponding y-value.

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 that relationship.