1. A correlation of zero between two quantitative variables means that
A. we have done something wrong in our calculation of r.
B. there is no association between the two variables.
C. there is no linear association between the two variables.
D. re-expressing the data will guarantee a linear association between the two variables.
E. none of the above
2. A study examined consumption levels of oil and carbon dioxide emissions sample of counties/ The response variable is:
A. oil
B. oil consumption
C. carbon dioxide emissions
D. countries
E. none of the above