Oseph claims that a scatterplot in which the y-values increase as the x-values increase must have a linear association. amy claims that the scatterplot could have a nonlinear association. which statement about their claims is true? joseph is correct because only a line will increase along the whole data set. the scatterplot will have a positive, linear association. joseph is correct because only a line will decrease along the whole data set. the scatterplot will have a negative, linear association. amy is correct because a nonlinear association could increase along the whole data set, while being steeper in some parts than others. the scatterplot could be linear or nonlinear. amy is correct because only a nonlinear association could increase along the whole data set. a line has the same slope at any point, but a curve can get steeper at different points.