When performing regression on a real world data set, which of the following does not need to be examined in order to choose the most appropriate model? 1. residuals plot
2. the value of r or R-squared
3. scatter plot
4. the x-intercept

Aplot of land in the shape of a vertical ellipse has a pole at each focus. the foci are 8 feet from the center. if the plot of land is 34 feet across the vertical axis, then it is (a.24 b. 30 c. 32 d. 36) feet across the other axis. the eccentricity of the ellipse traced by the boundary of this plot, rounded to the nearest thousandth, is (a.0.543 b.0.515 c.0.471 d. 0.459)