Trend Lines (Line of Best Fit)

Front

What is a trend line (line of best fit)?

Back

A trend line, or line of best fit, is a straight line that best represents the data on a scatter plot. It shows the general direction of the data points.

Front

What does it mean if a data point is an outlier?

Back

An outlier is a data point that differs significantly from other observations. It may indicate variability in the measurement or a different underlying process.

Front

How do you determine the coordinates of an outlier?

Back

The coordinates of an outlier are determined by identifying the point that is far away from the other data points on the graph.

Front

What is the purpose of a line of best fit?

Back

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

Front

What is a positive correlation?

Back

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

Front

What is a negative correlation?

Back

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

Front

What does no correlation mean?

Back

No correlation means that there is no apparent relationship between the two variables.

Front

How can you visually identify a line of best fit on a scatter plot?

Back

You can visually identify a line of best fit by drawing a straight line that minimizes the distance from all data points to the line.

Front

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

Back

The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

Front

What does the slope of a line represent?

Back

The slope of a line represents the rate of change between the two variables.