13. what does a correlation coefficient of r = - 0.97 generally imply about the graph of a data set? * 1 point a) the slope is positive, and a linear model is a good fit for the data. b) the slope is negative, and a linear model is a good fit for the data. c) the slope is positive, and a linear model is not a good fit for the data. d) the slope is negative, and a linear model is not a good fit for the data.