From a scatterplot, we observe that the dependent variable does not change when the independent variable increases. It suggests that the two variables are:
A. weakly, negatively correlated
B. strongly, positively correlated
C. uncorrelated
D. weakly, positively correlated
2. Suppose (X, Y) take on values {(1,10),(3,11),(5,14),(4,15),(7,20)}, the correlation coefficient is:
A. 0.11
B. 0.08
C. 0.75
D. 0.94
3. To describe the relationship between two categorical variables, we use:
A. scatter plot
B. boxplot
C. crosstabs
D. none of the above