CH 3 TEST only can take once

Front

What is the range of the correlation coefficient r?

Back

-1 ≤ r ≤ 1.

Front

What does a correlation of 0 indicate about the relationship between two variables?

Back

There is no association between the variables.

Front

What does it mean if two variables are negatively associated?

Back

Larger values of one variable are associated with smaller values of the other.

Front

If 49% of the variability in final grades is explained by the number of absences, what is the correlation r?

Back

r = -0.7.

Front

What does a negative residual indicate in a scatterplot?

Back

The observed value is less than the predicted value.

Front

How does adding an outlier affect the correlation?

Back

Correlation is resistant to outliers, so it may stay nearly the same.

Front

What is the definition of correlation?

Back

A statistical measure that describes the extent to which two variables change together.

Front

What does a correlation of r = 1 indicate?

Back

Perfect positive correlation between two variables.

Front

What does a correlation of r = -1 indicate?

Back

Perfect negative correlation between two variables.

Front

What is the formula for calculating the correlation coefficient r?

Back

r = Cov(X,Y) / (σX * σY), where Cov is covariance and σ is standard deviation.