Which data set indicates a perfect positive linear relationship between its two variables? Below are four bivariate data sets and their scatter plots. (Note that all of the scatter plots are displayed with the same scale.) Each data set is made up of sample values drawn from a population. X u 1.0 7.3 1.0 1.0 2.0 4.9 2.0 2.0 3.0 3.4 3.0 3.0 4.0 2.2 4.0 4.0 5.0 1.1 5.0 5.0 6.0 2.0 6.0 6.0 7.0 1.7 7.0 7.0 8.0 3.0 8.0 8.0 9.0 5.7 9.0 9.0 10.0 7.8 Figure 1 10.0 10.0 Figure 2 w n 1.0 2.9 10 1.0 7.2 10- 2.0 4.2 2.0 9.5 3.0 3.6 3.0 6.9 X 4.0 4.8 4.0 5.4 5.0 4.5 5.0 7.7 X 6.0 6.8 X 6.0 5.1 7.0 5.7 7.0 4.1 8.0 7.9 8.0 7.2 9.0 7.0 1 1 3 6 7 8 8 10 17 9.0 6.1 1 1 3 6 7 8 9 10 11 10.0 8.2 Figure 3 10.0 4.0 Figure 4 O u,v data set O w,t data set O m,n data set O x,y data set