Chapter 3 ~ Examining Relationships

Question 1

Response variable

Answer 1

Dependent variable, y

Question 2

Scatterplots are usually analysed according to:

Answer 2

Direction
Form
Strength
Outliers

Question 3

Correlation coefficient

Answer 3

Measures the direction and strength of the LINEAR relationship between two quantitative variables.
Denoted by the letter r.
-1 ≤ r ≤ 1

Question 4

Positive association

Answer 4

r is positive

Question 5

Perfect positive correlation

Answer 5

r = 1

Question 6

Negative association

Answer 6

r is negative

Question 7

Perfect negative correlation

Answer 7

r = -1

Question 8

no correlation

Answer 8

r = 0

Question 9

Extrapolation

Answer 9

The use of a regression line for prediction outside the range of values of the explanatory variable x used to obtain the line. Such predictions are often not accurate.

Question 10

Least Squares Regression Line

Answer 10

The equation of the line that makes the sum of the squares of the residuals as small as possible. Passes through the point (

Question 11

Explanatory variable

Answer 11

Independent variable, x