Scenario: Steel Manufacturing ~Suppose that a manufacturer strives to make steel rods with a diameter of 12 centimeters, but, due to the inaccurate nature of manufacturing, the actual diameters vary slightly from rod to rod. Suppose further that rods with diameters within 0.25 centimeters of the target value are considered to be within specifications (i.e., acceptable) for sale. Finally, suppose that 50 rods are collected for inspection from each of four manufacturing lines and that the graphs of their diameters are as follows: