AP Stats Unit 2 Review

Describe the correlation coefficient if

r = 0.90

• Positive, weak

• Positive, strong

• Negative, weak

• Negative, strong

Estimate the correlation coefficient.

• r is close to zero

• r is close to -1

• r is close to 1

• r is close to -1.5

• r is close to 1.5

Estimate the correlation coefficient

• r = 1

• r = -1

• r ≈ -0.8

• r ≈ 0.8

• r ≈ -0.5

Which residual plot shows that a linear regression model would be most appropriate?

• a

• b

• c

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

• YES

• NO

Shown is a residual plot. How many zero residuals are there?

• 5

• 1

• 3

• 0

which value of x has the greatest residual?

• 5

• 2

• 1

• 3

The correlation coefficient r is a value between

• 0 and 1

• 0 and 100

• -1 and 1

• -2 and 2

LSRL stands for

• Least Sum Regression Line

• Least Squares Regression Line

• Lower Standard Regression Line

• Line Scatterplot Regression Line

Describe the relationship.

• Positive linear relationship.

• Negative linear relationship.

• Positive curvilinear relationship.

• Negative curvilinear relationship.

Answer explanation

As x increases, y decreases.