Lines of Best Fit and Correlation Coefficients DSR 3-7

Front

What is a line of best fit?

Back

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

Front

What does a positive correlation indicate?

Back

As one variable increases, the other variable also increases.

Front

What does a negative correlation indicate?

Back

As one variable increases, the other variable decreases.

Front

What does a correlation coefficient (r) of 0 mean?

Back

There is no correlation between the two variables.

Front

What is the range of the correlation coefficient (r)?

Back

The range is from -1 to 1.

Front

What does a correlation coefficient (r) of -1 indicate?

Back

A perfect negative correlation between two variables.

Front

What does a correlation coefficient (r) of 1 indicate?

Back

A perfect positive correlation between two variables.

Front

What type of function is represented by a scatter plot that forms a U-shape?

Back

Quadratic function.

Front

How can you estimate the correlation coefficient from a scatter plot?

Back

By observing the direction and strength of the trend of the data points.

Front

What is the purpose of a line of best fit in data analysis?

Back

To make predictions and understand the relationship between variables.