11. Correlation

Given the following paired data: $(1,2)$, $(2,4)$, $(3,6)$, $(4,8)$, what is the value of the correlation coefficient $r$ for this data set?

Which of the following scatterplots best represents a correlation coefficient of $0.7$?

Given four scatterplots labeled $A$, $B$, $C$, and $D$, each showing a different relationship between two variables, which plot most likely represents the strongest linear correlation (either positive or negative) between the variables?

Which of the following scatterplots would have a correlation coefficient closest to $r=1$?

Given a scatterplot showing a strong negative linear relationship between two variables, which is most likely the correlation coefficient for the set of data shown?

Which of the following scatterplots best represents a situation where the correlation coefficient $r$ is approximately zero?

Which value of the correlation coefficient $r$ indicates a stronger correlation than $0.40$?

If the correlation coefficient $r$ equals $0.65$, which of the following best describes the relationship between the two variables?

Which of the following best describes the possible range of values for the correlation coefficient $r$?

Which of the following $r$-values represents the most moderate correlation?

Which of the following $r$-values represents the weakest correlation?

Which of the following situations best describes the concept of causation rather than just correlation?

Which of the following $r$-values represents the most moderate correlation?

Which of the following is a property of the linear correlation coefficient $r$?

If the correlation coefficient between $x$ and $y$ is equal to $-1.0$, which of the following statements is true?