=+47. An investigation of the relationship between the temperature (°F) at which a material is treated and the strength of the material involved an experiment in which four different strength observations were obtained at each of the temperatures 100, 110, 120, 130, and 140. A scatterplot of the data showed a substantial linear pattern. The least squares line fit to the data had a slope of .500 and a vertical intercept of 225.000.