Correlation Between Variables

Front

What is a positive correlation?

Back

A positive correlation occurs when two variables move in the same direction; as one variable increases, the other also increases.

Front

What is a negative correlation?

Back

A negative correlation occurs when two variables move in opposite directions; as one variable increases, the other decreases.

Front

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

Back

A correlation coefficient of 0 indicates no correlation between the two variables.

Front

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

Back

A correlation coefficient of 1 indicates a perfect positive correlation between the two variables.

Front

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

Back

A correlation coefficient of -1 indicates a perfect negative correlation between the two variables.

Front

How do you interpret a correlation coefficient of 0.85?

Back

A correlation coefficient of 0.85 indicates a strong positive correlation between the two variables.

Front

What is the purpose of a line of best fit?

Back

The line of best fit is used to represent the relationship between two variables in a scatter plot, helping to predict values.

Front

What is the formula for the line of best fit in linear regression?

Back

Front

What does the slope of a line of best fit represent?

Back

The slope of a line of best fit represents the rate of change of the dependent variable with respect to the independent variable.

Front

What is the significance of outliers in correlation analysis?

Back

Outliers can significantly affect the correlation coefficient and the line of best fit, potentially leading to misleading interpretations.