a. Use the statistical menu of your graphing utility to enter the seven data points

Chapter 2, Problem 81

(choose chapter or problem)

a. Use the statistical menu of your graphing utility to enter the seven data points shown in the scatter plot that you drew in Exercise 69(a). b. Use the STAT PLOT menu and the scatter plot capability to draw a scatter plot of the data points. c. Select the linear regression option. Use your utility to obtain values for a and b for the equation of the regression line, y = ax + b. Compare this equation to the one that you obtained by hand in Exercise 69. You may also be given a correlation coefficient, r. Values of r close to 1 indicate that the points can be modeled by a linear function and the regression line has a positive slope. Values of r close to -1 indicate that the points can be modeled by a linear function and the regression line has a negative slope. Values of r close to 0 indicate no linear relationship between the variables. In this case, a linear model does not accurately describe the data. d. Use the appropriate sequence (consult your manual) to graph the regression equation on top of the points in the scatter plot.