CS&SS/SOC/STAT 221: Quiz 3
May 7, 2015
VERSION: A - solution
A student was studying the relationship between how much money students spend on food and
on entertainment per week. Based on a sample size of 270, he calculated a correlation
coefficient (r) of .013 for these two variables. Which of the following is an appropriate
a. This low correlation of .013 indicates there is no relationship.
b. There is no linear relationship but there may be a nonlinear relationship.
c. This correlation indicates there is some type of linear relationship.
For Questions 2 – 5, consider the five scatterplots that are shown below in Figure 1:
For which plot in Figure 1 would correlation be an
summary of the relationship
between x and y?
Based on the scatterplots in Figure 1, in which plot do x and y have a correlation (r) of 0.9?