Write a program that graphically plots a regression line-that is, the line with the best

Chapter 8, Problem 13

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Write a program that graphically plots a regression line-that is, the line with the best fit through a collection of points. First ask the user to specify the data points by clicking on them in a graphics window. To find the end of input, place a small rectangle labeled "Done" in the lower-left comer of the window; the program will stop gathering points when the user clicks inside that rectangle. The regression line is the line with the following equation: y=y + m(x - x) where L XiYi - nxy m = ------==--------:-- L x - nx2 x is the mean of the x-values, y is the mean of the y-values, and n is the number of points. As the user clicks on points, the program should draw them in the graphics window and keep track of the count of input values and the running sum of x, y, x2, and xy values. When the user clicks inside the "Done" rectangle, the program then computes the value of y (using the equations above) corresponding to the x values at the left and right edges of the window to compute the endpoints of the regression line spanning the window. Mer the line is drawn, the program will pause for another mouse click before closing the window and quitting.