chapter 4

Question 1

What is a response variable?

Answer 1

measures an outcome of a study

Question 2

What is an explanatory variable?

Answer 2

may explain or influence changes in a response variable

Question 3

What is the best graph to display relationships between two quantitative variables?

Answer 3

scatterplot

Question 4

Define strength in terms of examining a scatterplot

Answer 4

determined by how close the points in the scatterplot lie to a simple form such as a line

Question 5

What does it mean to have a positive association?

Answer 5

when above-average values of one tend to accompany above-average values of the other, and below-average values also tend to occur together

Question 6

What association is when above-average values of one tend to accompany below-average values of the other and vice versa

Answer 6

negatively associated

Question 7

What are the ways to examine a scatterplot?

Answer 7

look at pattern via direction, form, and strength