Regression/Correlation Coefficients

Front

What is a correlation coefficient?

Back

A statistical measure that describes the strength and direction of a relationship between two variables.

Front

What does a positive correlation indicate?

Back

As one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate?

Back

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

Front

What is the range of correlation coefficients?

Back

The range is from -1 to +1.

Front

What does a correlation coefficient of 0 mean?

Back

It indicates no correlation between the two variables.

Front

What is a scatter plot?

Back

A graphical representation of two variables where each point represents an observation.

Front

What is a best-fit line?

Back

A line that best represents the data on a scatter plot, used for making predictions.

Front

How do you interpret a strong positive correlation (e.g., r = 0.9)?

Back

It indicates a strong relationship where both variables increase together.

Front

How do you interpret a strong negative correlation (e.g., r = -0.9)?

Back

It indicates a strong relationship where one variable increases while the other decreases.

Front

What is the purpose of regression analysis?

Back

To determine the relationship between variables and to make predictions.