What would be the notation for the mean of the y values? Homework Help 7DD. Regression notation of m, b, y1, x1, yi, xi, means of variables, estimates of variables (PDF) Dy (X yA golfer wants to determine if the type of driver she uses each year can be used to predict the amount of improvement in her game. Which variable would be the explanatory variable? Homework Help 7DA Linear, non-linear, positive and negative correlations (PDF) 7DC. Explanatory and response variables (PDF) The number of holes she plays The Improvement in her game The rating of the golfer The type of driver