Bivariate Statistics

When r^2 is closer to 1, the relationshp between two varables is

• Stronger

• Weaker

Least Square Regression Line is a linear model that________the sum of ___________residuals. 

Which of the following scatterplots show no association?

Select all that apply

• 
• 
• 
• 

A strong positive correlation has a r close to_____

• 0.93

• 0.49

• -1

• 0

A weak negative correlation has a r close to _______

• -1

• -0.49

• 0.93

• 0

Which graphs show a negative correlation?

Select all possible answers

• 
• 
• 

In a strong relationship between two variables in a scatterplot, the data closely follows a _______.

• Line

• Pattern

• Constant

Describe the correlation. r = 0.3

• Strong, positive

• Weak, positive

• Strong, negative

• Weak, negative

Describe the correlation:

r = -0.98

• Strong positive

• Weak positive

• Strong negative

• Weak negative

The correlation coefficient is a number "r" such that: 

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1