Trend lines

Front

What is a trend line?

Back

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

Front

What does a positive correlation indicate?

Back

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

Front

What does a negative correlation indicate?

Back

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

Front

What does 'no correlation' mean?

Back

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

Front

How do you determine the best fit trend line?

Back

The best fit trend line is determined by minimizing the distance between the data points and the line, often using methods like least squares.

Front

What is the purpose of a trend line in data analysis?

Back

The purpose of a trend line is to summarize the relationship between variables and to make predictions based on the data.

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for typically two variables for a set of data.

Front

What does it mean if a trend line slopes upwards?

Back

If a trend line slopes upwards, it indicates a positive correlation between the variables.

Front

What does it mean if a trend line slopes downwards?

Back

If a trend line slopes downwards, it indicates a negative correlation between the variables.

Front

What is the solution to the system of equations represented by two intersecting lines?

Back

The solution is the point where the two lines intersect, representing the values of the variables that satisfy both equations.