Linear Correlations

On a scatter plot, where can you find PREDICTED y-values?

• The data points
• On the regression line

On a scatter plot, where can you find ACTUAL y-values?

• The data points
• On the regression line

Which indicates a causal relationship?

• A rooster crowing and the sun rising
• Driving more miles and using more gas
• Eating salty food and buying a drink
• Going to the beach and building a sand castle

Estimate the correlation coefficient.

• r = -0.8
• r = -0.5
• r = 0.5
• r = 0.8

Shown is a residual plot. Would a linear regression model of the data be most appropriate?

• YES
• NO

What should a residual plot look like?

• Distinct Pattern
• Curve
• Random

As study time _______________, errors _______________.

• increases ; decrease
• increases ; increase
• decreases; decrease
• increases ; stays the same

Shown is a residual plot.
Would a linear regression model be a good fit?

• YES
• NO

This implies that one variable has a direct affect on the other variable.

• Correlation
• Causation

A correlation shows that two things are

• related
• causing each other
• unrelated