Trend Lines (Line of Best Fit)

Front

What is a line of best fit used for?

Back

To make predictions.

Front

What type of association does a graph show if there is no clear trend?

Back

None.

Front

What are outliers in a data set?

Back

Data points that are significantly different from others.

Front

What does a positive association in a graph indicate?

Back

As one variable increases, the other variable also increases.

Front

What does a negative association in a graph indicate?

Back

As one variable increases, the other variable decreases.

Front

What is the purpose of a scatter plot?

Back

To display the relationship between two variables.

Front

How do you identify an outlier on a scatter plot?

Back

Look for points that are far away from the cluster of other points.

Front

What is the equation of a line of best fit?

Back

A linear equation that best represents the data points.

Front

What does the slope of a line of best fit represent?

Back

The rate of change between the two variables.

Front

What does the y-intercept in a line equation represent?

Back

The value of y when x is zero.