Linear Regression Flashcard

Front

What is the correlation coefficient?

Back

A statistical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.

Front

What does a correlation coefficient of r = 1 indicate?

Back

A perfect positive linear relationship between two variables.

Front

What does a correlation coefficient of r = -1 indicate?

Back

A perfect negative linear relationship between two variables.

Front

What does a correlation coefficient of r ≈ 0 indicate?

Back

No linear correlation between the variables.

Front

What does a correlation coefficient of r ≈ -0.8 suggest?

Back

A strong negative correlation between the two variables.

Front

What does a weak negative correlation mean?

Back

As one variable increases, the other variable tends to decrease slightly.

Front

What is a line of best fit?

Back

A straight line that best represents the data on a scatter plot, minimizing the distance between the line and all data points.

Front

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

Back

By visually assessing which line minimizes the distance to the majority of the data points.

Front

What does a correlation coefficient of r = -0.26 indicate?

Back

A weak negative correlation between the two variables.

Front

What is a scatter plot?

Back

A graphical representation of two variables, showing the relationship between them using dots.