The accompanying data resulted from an experiment in which weld diameter and shear strength (in pounds) were determined for five different spot welds on steel. Below are the data collected and the regression equation. Diameter Strength 813.7 200.1 210.1 785.3 220.1 960.4 230.1 1118.0 240.0 1076.2
Strength = -941.6992 + 8.5988 Diameter The predicted y-hat value for a diameter of 201 is 864. Interpret this predicted value. If the diameter were to increase by 20, then we would expect the mean strength to increase by 864. If the diameter is 201 then we would expect the mean strength to be 864. If the diameter were to increase by one unit, we expect the mean strength to increase by 864 If the diameter were 0, ten we would expect the mean strength to be 864.